"nightingale," late 14c., from Greek Philomela, poetic name of the nightingale, in mythology the daughter of Pandion, transformed into a nightingale; probably literally "lover of song," from philos "loving" + melos "a tune, song;" but perhaps "lover of apples" (Greek mela). In the myth, proper name of Pandion's daughter, who was turned into a nightingale (Ovid).
