[ap-teer-ee-uh m]
noun, plural ap·te·ri·a [ap-teer-ee-uh] /æpˈtɪər i ə/. Ornithology.
  1. one of the featherless portions of the skin of a bird.
Compare pteryla.

Origin of apterium

From New Latin, dating back to 1865–70; see origin at a-6, pter-, -ium
Related formsap·te·ri·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018