Œ

Œ (minuscule: œ), in English known as ethel or œthel (also spelt, ēðel, odal), is a Latin alphabet grapheme, a ligature of o and e. In medieval and early modern Latin, it was used in borrowings from Greek that originally contained the diphthong οι, and in a few non-Greek words. These usages continue in English and French. In French, the words that were borrowed from Latin and contained the Latin diphthong written as œ now generally have é or è; but œ is still used in some non-learned French words, representing open-mid front rounded vowels, such as œil ("eye") and sœur ("sister").

It is used in the modern orthography for Old West Norse and is used in the International Phonetic Alphabet to represent the open-mid front rounded vowel. In English runology, œ ɶ is used to transliterate the rune othala ᛟ (Old English: ēðel, "estate, ancestral home"), of which English derives its name.

Classical Latin wrote the o and e separately (as has today again become the general practice), but the ligature was used by medieval and early modern writings, in part because the diphthongal sound had, by Late Latin, merged into the sound [e]. The classical diphthong had the value [oe̯], similar to (standard) English oi as in choice. It occurs most often in borrowings from Greek, rendering that language's οι (in majuscule ΟΙ), although it is also used in some native words such as coepi "I began".

In French, œ is called e dans l'o [ə dɑ̃ lo], which means e in the o (a mnemotechnic pun used first at school, sounding like (des) œufs dans l'eau, meaning eggs in water) or sometimes o et e collés, (literally o and e glued) and is a true linguistic ligature, not just a typographic one (like the fi or fl ligatures), reflecting etymology. In Canadian French, the names o-e liés ("linked O and E") or lettre double œ (where O and E are pronounced separately for clarity) are used officially. Œ is most prominent in the words mœurs ("mores"), cœur ("heart"), chœur ("choir"), sœur ("sister"), œuf ("egg"), bœuf ("beef", "steer"), œuvre ("work") and œil ("eye"), in which the digraph œu, like eu, represents the sound [œ] (in other cases, like plurals œufs ("eggs") and bœufs ("steers"), it stands for [ø]).

French also uses œ in direct borrowings from Latin and Greek. So, "coeliac" in French is cœliaque, "fetus / foetus" is fœtus and "Oedipus" is Œdipe. In such cases, the œ is classically pronounced [e], or, sometimes, in modern pronunciation, [œ]. In some words, like phénix and économique, the etymological œ is changed to é.

In French placenames or family names of Germanic origin (mostly in and around Alsace-Lorraine, historically Germanic-speaking areas that have changed hands between France and Germany (or Prussia before 1871) a number of times), œ replaces German ö and is pronounced [œ]. Examples include Schœneck (Moselle), Kœtzingue (Haut-Rhin), and Hœrdt (Bas-Rhin) for placenames, or Schœlcher (as in Victor Schœlcher) for surnames.

In all cases, œ is alphabetized as oe, rather than as a separate letter.

When oe occurs in French without the ligature, it is pronounced /wa/ or sometimes /wɛ/, just like words spelt with oi. The most common words of this type are poêle ("stove", "frying pan") and moelleux ("soft"). poêle is itself an etymological spelling, with the ê reflecting its derivation from Latin patella. If the oe is not to be pronounced thus, then a diaeresis, acute or grave accent needs to be added in order to indicate that the vowels should be pronounced separately. For example, Noël, poésie, poète. The exception to this rule is when a morpheme ending in o is joined to one beginning in e, as in électroencéphalogramme, or with the prefix co-, which is always pronounced /ko/ in hiatus with the following vowel, as in coefficient ("ratio", "coefficient").