noun,plural ap·te·ri·a [ap-teer-ee-uh]. /æpˈtɪər i ə/. Ornithology.
one of the featherless portions of the skin of a bird.
- ap·te·ri·al, adjective
- Compare pteryla.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use apterium in a sentence
But, the male loses most of the down feathers of the ventral apterium.Natural History of the Bell Vireo, Vireo bellii Audubon | Jon C. Barlow