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Labiodental consonant
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This article contains phonetic transcriptions in the International Phonetic Alphabet (IPA). For an introductory guide on IPA symbols, see Help:IPA. For the distinction between [ ], / / and ⟨ ⟩, see IPA § Brackets and transcription delimiters.

In phonetics, labiodentals are consonants articulated with the lower lip and the upper teeth, such as [f] and [v]. In English, labiodentalized /s/, /z/ and /r/ are characteristic of some individuals; these may be written [sᶹ], [zᶹ], [ɹᶹ].[1]

Labiodental consonants in the IPA

[edit]

The labiodental consonants identified by the International Phonetic Alphabet are:

IPA Description Example
Language Orthography IPA Meaning
ɱ̊ voiceless labiodental nasal Angami[2] [example needed] allophone of /m̥/ before /ə/
ɱ voiced labiodental nasal Kukuya[3] (disputed) [ɱíì] 'eyes'
p̪ voiceless labiodental plosive Greek σάπφειρος [ˈsap̪firo̞s̠] 'sapphire'
b̪ voiced labiodental plosive Sika [example needed]
p̪͜f voiceless labiodental affricate Tsonga timpfuvu [tiɱp̪͜fuβu] 'hippos'
b̪͜v voiced labiodental affricate Tsonga shilebvu [ʃileb̪͜vu] 'chin'
f voiceless labiodental fricative English fan [fæn]
v voiced labiodental fricative English van [væn]
ʋ voiced labiodental approximant Dutch wang [ʋɑŋ] 'cheek'
ⱱ voiced labiodental flap Mono vwa [ⱱa] 'send'
p̪͜fʼ labiodental ejective affricate Tsetsaut[4][5] apfʼo [ap̪͜fʼo] 'boil'
fʼ labiodental ejective fricative Yapese[6] fʼaang [fʼaːŋ] 'type of eel'
ʘ̪ labiodental click release (many different consonants) Nǁng ʘoe [k͜ʘ̪oe] 'meat'

The IPA chart shades out labiodental lateral consonants.[7] This is sometimes read as indicating that such sounds are not possible. In fact, the fricatives [f] and [v] often have lateral airflow, but no language makes a distinction for centrality, and the allophony is not noticeable.

The IPA symbol ɧ was devised for a consonant of Swedish that has various pronunciations, in one dialect a rounded velarized labiodental less ambiguously transcribed as [fˠʷ]. The labiodental click is an allophonic variant of the (bi)labial click.

Occurrence

[edit]

The only common labiodental sounds to occur phonemically are the fricatives and the approximant. The labiodental flap occurs phonemically in over a dozen languages, but it is restricted geographically to central and southeastern Africa.[8] With most other manners of articulation, the norm are bilabial consonants (which together with labiodentals, form the class of labial consonants).

[ɱ] is quite common, but in nearly all languages in which it occurs, it occurs only as an allophone of /m/ before labiodental consonants such as /v/ and /f/. It has been reported to occur phonemically in a dialect of Teke, but similar claims in the past have proven spurious.

The XiNkuna dialect of Tsonga features a pair of affricates as phonemes. In some other languages, such as Xhosa, affricates may occur as allophones of the fricatives. These differ from the German voiceless labiodental affricate ⟨pf⟩, which commences with a bilabial p. All these affricates are rare sounds.[citation needed]

The stops are not confirmed to exist as separate phonemes in any language. They are sometimes written as ȹ ȸ (qp and db ligatures). They may also be found in children's speech or as speech impediments.[9]

Origins

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The frequency of labiodentals (especially f and v) has been argued to be linked to the Agricultural Revolution.[10][11]

See also

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References

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Sources

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Further reading

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Labiodental consonant

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A labiodental consonant is a type of consonantal sound articulated with the lower lip serving as the active articulator against the upper teeth as the passive articulator, creating a constriction in the vocal tract that modifies airflow. These consonants are classified by their as labiodental and occur in various manners, most commonly as fricatives where air passes through a narrow channel producing turbulent friction. In English, the primary examples are the , as in "fin," and the , as in "vine." Labiodental consonants appear in the phonemic inventories of numerous languages worldwide, often as fricatives that contrast in voicing, contributing to distinctions in meaning. Beyond fricatives, the labiodental place is used for other manners in specific contexts or languages; for instance, a voiced labiodental approximant [ʋ], which involves minimal constriction similar to a weak , occurs in languages such as Isoko (a Niger-Congo language spoken in ). The labiodental nasal [ɱ] is another variant, typically realized as an allophone of the bilabial nasal /m/ before labiodental fricatives, as in English "symphony" pronounced approximately as [ˈsɪɱfəni]. Rarer labiodental sounds include the labiodental flap [ⱱ], a brief percussive contact of the lower lip against the upper teeth, attested in select African languages such as those in the Central Sudanic branch of Nilo-Saharan and of Afro-Asiatic. Labiodental stops are virtually absent across languages due to the anatomical challenges of complete closure at this site without leakage. Overall, labiodentals are a productive but relatively fronted , influencing phonological patterns like assimilation in many speech communities.

Phonetic Characteristics

Articulation

Labiodental consonants are produced through articulation involving contact or approximation between the lower and the upper teeth, creating a constriction in the vocal tract. This is distinct from bilabial sounds, which rely on the two lips coming together, and from interdental articulations, which involve the tip or against the teeth. The lower acts as the active due to its high mobility, allowing it to elevate and press against or near the upper teeth, which serve as the passive in their fixed position. This configuration enables complete closure for stop consonants or a narrow channel for turbulent in fricatives, where the lip-teeth contact generates . The primary for labiodental consonants is pulmonic egressive, in which air is expelled outward from the lungs through the contraction of respiratory muscles. While this is the standard mechanism across nearly all languages for such , non-pulmonic variants like glottalic egressive (ejectives) or ingressive (implosives) are theoretically conceivable but unattested for labiodental places of articulation. Acoustically, labiodental fricatives exhibit a relatively flat with frication noise arising from the turbulent through the relatively small dental , extending up to approximately 10 kHz and generally lower intensity compared to fricatives at other places due to the anterior location and jet-surface interactions with the teeth and . Anatomical prerequisites for efficient labiodental articulation include an or overjet, where the upper incisors protrude over the lower ones, positioning the lower lip closer to the upper teeth and reducing the muscular effort required for contact. Variations in dental structure, such as edge-to-edge bites prevalent in populations with heavy occlusal wear from coarse diets, can hinder production by increasing the distance the lower lip must travel, potentially leading to substitutions or greater articulatory demands.

Types and Manners of Articulation

Labiodental consonants are classified primarily by their , which describes how the is modified during production at the labiodental , involving contact between the lower and upper teeth. The most prevalent manner is that of fricatives, produced with turbulent through a narrow channel formed by the lower and upper teeth, resulting in audible . These fricatives exhibit voicing contrasts, with voiceless variants lacking vocal fold and voiced variants involving , alongside rarer laryngeal features such as aspiration in some contexts where includes a breathy release. Stops or plosives, involving a complete closure to build up oral pressure before release, are extremely rare among labiodental due to the anatomical difficulty in achieving a airtight seal between the soft lower lip and rigid upper teeth, which often permits air leakage and prevents sufficient pressure accumulation. When attested, they may show voiceless, voiced, or aspirated forms, with ejection (glottalized release) being virtually absent owing to the same articulatory constraints. Nasals, by contrast, are more feasible, featuring a lowered velum to direct airflow through the while the oral closure at the teeth-lip contact is maintained; these are typically voiced, though voiceless nasals occur sparingly in specific phonetic environments, and the labiodental nasal [ɱ] typically occurs as an of the bilabial nasal /m/ before labiodental fricatives in many languages. Approximants involve a smooth, non-turbulent airflow with the lower lip approaching but not constricting against the upper teeth, usually voiced and lacking significant friction. Flaps entail a brief, single contact or tap of the lower lip against the upper teeth, interrupting airflow momentarily; these are rare, predominantly voiced, and concentrated in certain African languages, with voiceless variants even scarcer. Trills, requiring multiple rapid vibrations of the lower lip against the teeth, and laterals, necessitating lateral airflow around a central closure, are phonetically unstable and unattested in natural languages, as the lip's flexibility hinders sustained vibration or directed lateral escape of air without reverting to fricative-like turbulence. Affricates combine a stop closure with a fricative release at the labiodental site, typically voiceless and rare, often influenced by adjacent bilabial elements in realization. Realizations of labiodental consonants may exhibit slight bilabial influence, such as lip rounding, particularly in or nasals, deviating from strict lip-teeth contact. Retroflexion, involving curling, is incompatible and absent in pure labiodental articulations. Breathy-voiced variants, marked by a murmured laryngeal setting, appear in some fricatives or but remain marginal compared to standard voicing distinctions.

Representation in the IPA

Core Symbols

The core symbols in the International Phonetic Alphabet (IPA) for labiodental consonants represent the most frequently occurring manners of articulation at this , where the lower lip contacts the upper teeth. The is transcribed as , produced by directing airflow through a narrow channel between the lower lip and upper teeth, creating turbulent noise without vocal fold vibration. The voiced counterpart, the , involves the same constriction but with added vocal fold vibration for voicing. The [ʋ] denotes a smoother, non-turbulent approximation without frication, often occurring as an or in specific languages. Finally, the labiodental nasal [ɱ] is symbolized for nasal airflow through the same labiodental closure, typically appearing before labiodental fricatives in assimilation processes. Diacritics modify these core symbols to indicate variations in articulation or phonation. The dental diacritic, a subscript dot (̪), specifies a more dental contact, as in [f̪] for a labiodental fricative with the lip against the teeth edges rather than the inner surface. Voicing modifications include the voiceless diacritic (̥) for devoiced versions, such as [v̥], and the voiced diacritic (̬) for added voicing, like [f̬], though these are less common for the inherently voiced or voiceless pairs. Breathy voicing can be marked with (̤), as in [v̤], to capture breathier realizations in certain phonetic contexts. The historical development of these symbols traces back to the IPA's origins in , when the adopted and directly from to represent the familiar labiodental s, reflecting their widespread use in European languages. The nasal [ɱ], a modified 'm' with a hook, was included in early charts to distinguish it from the bilabial . The approximant symbol [ʋ], a turned 'v', is used to represent the non-fricative labiodental , distinguishing it from the fricative . IPA transcription guidelines emphasize precise articulation for symbol selection: , , [ʋ], and [ɱ] are reserved for sounds where the lower lip actively contacts the upper teeth, contrasting with bilabial symbols like [ɸ] or [β] for lip-to-lip approximations without dental involvement. Transcribers should use diacritics like (̪) only when the dental quality deviates from the standard labiodental norm, prioritizing the core symbols for typical realizations to maintain consistency across languages. In major languages like English, these sounds are commonly represented orthographically by the letters for the voiceless fricative (as in "fan") and for the voiced fricative (as in "van"), with occasional digraphs like

for in loanwords from Greek origins. The approximant [ʋ] and nasal [ɱ] lack dedicated orthographic symbols in English but appear in phonetic transcriptions or assimilated forms, such as [ɱ] in "comfort" before /f/.

Extended and Rare Symbols

Beyond the core fricative symbols such as and , the International Phonetic Alphabet (IPA) accommodates extended symbols for rarer labiodental articulations, primarily through diacritics or dedicated characters to denote non-standard manners of articulation. For instance, labiodental stops are represented as [p̪] for voiceless and [b̪] for voiced, where the subscript dental diacritic (̪) specifies the upper teeth as the passive articulator against the lower lip; these are not part of the standard pulmonic consonant chart but appear in the Extensions to the IPA (extIPA) for transcribing atypical speech patterns. Similarly, labiodental affricates combine a stop closure with fricative release, transcribed as [p̪͡f] (voiceless) and [b̪͡v] (voiced), using a tie bar (͡) to indicate the unitary nature of the sound; these are infrequently attested and justified phonetically for languages where the stop and fricative share the labiodental place. The voiced labiodental flap [ⱱ], involving a brief outward flip of the lower lip against the upper teeth, received official IPA recognition in 2005 as a distinct manner, filling a gap for transient articulations not captured by approximants like [ʋ]; its phonetic validity stems from acoustic and articulatory studies confirming its perceptual distinctiveness from fricatives. For ejective realizations, the labiodental ejective fricative [fʼ] employs a right apostrophe diacritic to mark glottalic egress, a rare type documented in Northwest Caucasian languages where velaric pressure combines with frication; this symbol's use is limited due to the scarcity of such sounds cross-linguistically. Certain proposed labiodental symbols remain obsolete or unverified in the IPA framework, particularly for manners incompatible with the articulatory constraints of lip-teeth contact. The labiodental lateral [ɬ̪] and trill [ʙ̪] (adapting the bilabial trill symbol with a dental ) are shaded in the 2015 IPA pulmonic consonant chart, indicating they are judged articulatorily impossible or unattested, as lateral or multiple lip vibrations cannot readily occur without shifting to adjacent places like dentolabial. These notations appear sporadically in older literature but lack empirical support in modern phonetic inventories. In clinical and developmental , extended IPA symbols for labiodental consonants find application in documenting speech disorders and early . For example, [p̪] and [b̪] may describe substitutions in lisps or frontal lisps where fricatives are impeded, while [ⱱ] captures immature in child speech before maturation; the extIPA system, revised in 2015 with further revisions in 2017 and 2024, validates these for precise transcription in therapeutic contexts.

Distribution Across Languages

Common Occurrences

Labiodental fricatives, particularly the voiceless and voiced , are relatively common consonants across the world's languages. According to the UCLA Phonological Segment Inventory Database (UPSID), which samples 451 languages, occurs in 180 languages (approximately 40%), while is attested in 95 languages (about 21%). More recent data from PHOIBLE 2.0 (as of 2019, covering 3,020 languages) indicate in approximately 47% and in 27% of inventories. The labiodental approximant [ʋ] appears frequently in , often as the primary realization of the /v/. These sounds frequently hold phonemic status in major language families. In Germanic languages such as English, /f/ and /v/ are distinct phonemes, contrasting in minimal pairs like fin /fɪn/ versus vin (a borrowing, but illustrative of the contrast). In Romance languages like French, /f/ is a core phoneme, as in fleur /flœʁ/, and /v/ appears in words like vive /viv/. Sino-Tibetan languages, including Mandarin Chinese, also feature /f/ as a phoneme, exemplified in fāng /faŋ/ "square." Representative examples highlight their use in everyday vocabulary. In English, the word five is pronounced [faɪv], featuring both and . In Swahili, fumbo "riddle" is [ˈfumbo], showcasing in initial position. Labiodental consonants commonly appear in initial, medial, and final positions within words across languages that inventory them. For instance, in English, occurs initially in fan, medially in effort, and finally in laugh. Similar patterns hold in French, with initial in fromage, medial in affaire, and final in neuf. Co-occurrence restrictions exist in some languages; for example, in Dutch, the approximant [ʋ] is somewhat limited before non-back rounded vowels. Typological studies indicate that labiodental fricatives are more prevalent in languages associated with post-Neolithic agricultural societies, where softer-food diets facilitated their articulation, as explored in and phonetic surveys.

Rare and Allophonic Instances

The [ɱ] occurs as a non-contrastive of the bilabial nasal /m/ in many languages, including English, where it appears before labiodental fricatives such as /f/ and /v/. For example, the word "emphasis" is typically realized as [ˈɛmfəsɪs] in underlying representation but surfaces as [ˈɛɱfəsɪs] due to anticipatory assimilation at the lower lip and upper teeth. This assimilation is widespread across but remains allophonic, lacking phonemic status. Labiodental flaps [ⱱ], produced by a brief flapping of the lower lip against the upper teeth, are rare overall but documented as phonemes in a handful of Central African languages, including Mono, a Ubangian language of the Central African Republic, where they contrast with other labial approximants in words like vwa [ⱱa] 'to hear'. In contrast, [ⱱ] appears allophonically in some Austronesian languages outside the African core, functioning as a variant of /v/ in intervocalic positions to reduce articulatory effort. These instances highlight the flap's limited distribution, confined to fewer than 100 languages globally. Labiodental stops and affricates, such as [p̪͍] or [b̪͍], are exceptionally uncommon as phonemes and typically emerge only as allophones or in speech errors across s. No language has been conclusively documented with contrastive labiodental stops, though transient realizations occur in dialects or disfluencies where bilabial stops to following labiodental fricatives, as occasionally reported in Southern African varieties. In Australian languages like Arrernte, dental stops [t̪] exist but do not extend to true labiodental articulations, underscoring the segment's phonological marginality. Affricated variants, if present, are similarly non-contrastive and tied to rapid speech transitions. Ingressive labiodental clicks [ʘ̪], involving suction at the lip-teeth interface, are attested in a small number of non-Khoe click languages, including Nǁng, a Tuu of , where they serve as releases for various consonantal accompaniments in words like ʘoe [k͜ʘ̪oe] 'meat'. Approximately 10 such cases are documented across click inventories, often as variants of bilabial clicks [ʘ] with a forward-shifted articulation. These clicks are non-pulmonic and restricted to southern African click languages, with no phonemic role in non-click families. The rarity of non-fricative labiodental consonants stems from articulatory challenges, including the instability of lip-teeth closure for stops and nasals, which demands precise coordination without sufficient aerodynamic support compared to bilabial or dental equivalents. Phonological instability further limits their occurrence, as they prone to assimilation or deletion in sequences, per cross-linguistic surveys. Phonetic analyses attribute this to evolutionary pressures favoring more stable places of articulation in human speech inventories.

Dentolabial Consonants

Dentolabial consonants are articulated by pressing the upper lip against the lower teeth, reversing the typical labiodental configuration in which the lower lip contacts the upper teeth. This articulation is uncommon due to its anatomical awkwardness, as it often necessitates a head tilt or protrusion of the lower jaw to achieve sufficient contact for sound production. Known instances include the voiceless dentolabial [f͆] in the Qaassimiutut of , an Eskimo-Aleut language spoken in southern , where it occurs as a . These sounds are documented in linguistic studies of minority languages, highlighting their role in fricative inventories. Phonetically, dentolabial consonants generate weaker and airflow restriction compared to labiodentals, owing to the reversed roles, which can result in reduced acoustic intensity and perceptual confusion with interdental fricatives such as [θ]. This diminished arises from the less efficient constriction geometry, making the sounds perceptually subtler. Documentation of dentolabial consonants in natural speech first emerged from linguistic fieldwork in the 1970s, particularly in studies of minority languages, with audio recordings preserved in archives like those of the SIL International and university linguistic databases. These early recordings provided instrumental evidence of their articulation, aiding in the development of extended IPA notation for rare sounds. Typological surveys indicate extreme rarity, with fewer than 5 languages worldwide featuring dentolabial consonants as phonemes or contrastive allophones as of 2024. This underscores their marginal status in global phonological inventories, primarily confined to specific families.

Comparisons with Bilabial Consonants

Labiodental consonants, particularly fricatives like and , exhibit distinct phonological contrasts with bilabial consonants such as stops [p, b] and rare fricatives [ɸ, β]. Acoustically, labiodental fricatives produce higher levels of due to the narrower between the lower lip and upper teeth, resulting in peaks around 4-8 kHz, compared to the lower-intensity, more diffuse of bilabial fricatives with peaks below 2 kHz. This difference enhances the perceptual salience of labiodentals, as their is more concentrated in higher frequencies. In contrast, bilabial articulations involve greater lip protrusion and , which lowers the second (F2) of adjacent vowels by up to 200-300 Hz more than the minimal in labiodentals, leading to relatively backer vowel qualities following bilabials. Substitution patterns between labiodental and bilabial consonants are common in both developmental and diachronic contexts, often favoring labiodentals for fricative manners due to their greater auditory prominence. In child language acquisition, bilabial stops like and are typically mastered by age 3 years, preceding labiodental fricatives and , which are acquired around 3.5-4.5 years; however, children with dental overjet may substitute labiodental for bilabial to compensate for bite misalignment. Diachronically, bilabial fricatives frequently shift to labiodentals across languages, as seen in various Indo-European and Niger-Congo varieties where [ɸ] or [β] becomes or to increase noise intensity and perceptual distinctiveness. Perceptually, labiodental fricatives are distinguished by a characteristic diffuse hiss arising from turbulence at the lip-teeth interface, allowing listeners to identify them even in through elevated high-frequency energy above 4 kHz. Bilabial , by comparison, lack this dental component and are cued primarily by visual lip rounding and closure, with acoustic bursts or transitions emphasizing lower-mid frequency bursts around 500-1500 Hz for stops. In typological surveys of sound inventories, bilabial places dominate for stops and nasals (present in over 90% of languages), while labiodentals prevail for fricatives (e.g., in ~41% of languages, in ~21%), and interdentals are rarer still ([θ] in ~8%, [ð] in ~5%), reflecting a progression of decreasing from pure bilabial to labiodental to coronal-influenced labial places. This underscores the aerodynamic and perceptual advantages of bilabials for closure manners and labiodentals for continuants. Cross-linguistically, mergers often simplify labiodental fricatives to bilabial variants in intervocalic positions, as in where the /b/ (spelled or ) is realized as the or [β] rather than labiodental , reducing articulatory effort while maintaining voicing. This pattern highlights the functional overlap in labial regions, with bilabial realizations preferred in languages lacking phonemic labiodental-labial contrasts.

Historical and Evolutionary Aspects

Origins in Human Speech

Labiodental consonants, such as the fricatives and , are believed to have emerged as prominent features in phonologies following significant dietary and anatomical shifts during the period, approximately 12,000 years ago. Prior to this, in societies with harder diets, languages rarely featured these sounds, nearly absent from languages (close to 0% of consonants) compared to about 2% in agricultural populations. This timeline aligns with the development of modern speech capabilities in around 50,000–70,000 years ago, but labiodentals specifically gained traction later due to biomechanical advantages in articulation. The anatomical basis for labiodental consonants lies in human dentition, particularly the of an and overjet configuration, where the upper incisors protrude beyond the lower ones. In contrast, non-human and early hominids exhibit an edge-to-edge bite with flatter teeth, which demands significantly more muscular effort—up to 29% more—for producing labiodentals. This human-specific dental alignment, facilitated by softer, processed foods post-Neolithic, allows the lower lip to more easily contact the upper teeth, reducing articulatory strain and favoring the integration of these sounds into speech inventories. evidence from hominid jaw reconstructions, including those of Neanderthals and early Homo sapiens dated to around 100,000 BCE, indicates the potential for varied articulations but highlights that the enabling efficient labiodentals developed later with dietary changes. Hypotheses regarding early human languages, including speculative Proto-World reconstructions, suggest labiodentals may represent innovations derived from bilabial stops like and , rather than core elements of ancestral phonologies. Reconstructed proto-languages from major families, such as Proto-Indo-European and Proto-Austronesian, typically lack labiodental fricatives, supporting their status as later developments rather than primitives in human speech evolution. Recent genetic studies, including those on variants of the associated with orofacial , underscore the role of enhanced lip precision in fine-tuning articulatory skills necessary for complex .

Phonological Shifts and Frequency Changes

One prominent example of a phonological shift involving labiodentals is Grimm's Law, a series of systematic consonant changes that occurred as Proto-Indo-European evolved into Proto-Germanic around the early centuries CE. Under this law, the Proto-Indo-European voiceless bilabial stop *p shifted to the voiceless labiodental fricative *f in Proto-Germanic, as seen in cognates like Latin pater ("father") and English father. This transformation contributed to the widespread presence of labiodentals in Germanic languages, distinguishing them from other Indo-European branches that retained bilabial stops. In , patterns often prohibit multiple labial articulations within , reflecting a broader avoidance of articulatory similarity and promoting phonological diversity while maintaining lexical transparency. Diachronic studies reveal shifts in the frequency of labiodentals tied to socio-economic changes, notably an increase following the Agricultural Revolution around 10,000 BCE. Softer diets from farming and led to biomechanical adaptations in human bite configuration, facilitating the production and retention of labiodental sounds like and , particularly in farming-related vocabulary that entered languages during this period. Blasi et al. (2019) analyzed global linguistic databases and phylogenies, finding that labiodentals became more prevalent in Eurasian languages post-, correlating with development and lexical innovations in . In modern times, has accelerated the spread of labiodentals through English's influence as a , introducing and into contact languages via loanwords and . This trend contrasts with diachronic rarity in language isolates, such as Basque, where historical shows a preference for bilabials over labiodentals, with no native /f/ or /v/ in pre-contact varieties—reflected in the traditional inventory favoring /p/ and /b/ instead. Basque's conservatism highlights how isolates can resist external pressures, maintaining bilabial dominance despite later borrowings.

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  36. https://www.mimicmethod.com/master-class/spanish/drills/voiced-bilabial-fricative-approximant/
  37. https://royalsocietypublishing.org/doi/10.1098/rstb.2020.0195
  38. https://pmc.ncbi.nlm.nih.gov/articles/PMC8059537/
  39. https://linguistics.stackexchange.com/questions/39123/why-do-so-many-ancient-reconstructed-languages-lack-labial-fricatives
  40. https://www.embopress.org/doi/10.15252/embr.201847618
  41. https://lrc.la.utexas.edu/books/pgmc/2-phonology
  42. https://www.tandfonline.com/doi/pdf/10.1080/00437956.1950.11659378
  43. https://www.buber.net/Basque/Euskara/Larry/WebSite/basque.sketch.php
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