œ

from the GNU version of the Collaborative International Dictionary of English.

• a diphthong, employed in the Latin language, and thence in the English language, as the representative of the Greek diphthong oi. In many words in common use, e alone stands instead of œ. Classicists prefer to write the diphthong oe separate in Latin words.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Ligature of Latin letters o and e.
• noun open-mid front rounded vowel
• noun Ligature of vowels o and e.