apterium

== English == === Etymology === From a- +‎ Ancient Greek πτερόν (pterón, “feather”) + -ium. Compare Ancient Greek ἄπτερος (ápteros, “featherless”). === Pronunciation === Rhymes: -ɪəɹiəm === Noun === apterium (plural apteria) (ornithology) An area of bare (featherless) skin on a bird. ==== Coordinate terms ==== pteryla ==== Translations ====