1. oe - Noun
2. oe - Adjective
4. Oe - Proper noun
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 /. Classicists prefer to write the diphthong oe separate in Latin words.
Source: Webster's dictionary