Dictionary
ap•te•ri•um
Pronunciation: (ap-tēr'ē-um), [key]—
n.,
—pl. -te•ri•aPronunciation: (-tēr'ē-u). [key]
Ornith.
one of the featherless portions of the skin of a bird. Cf.
pteryla.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.