Dictionary
pi•le•um
Pronunciation: (pī'lē-um, pil'ē-), [key]—
n.,
—pl. pi•le•aPronunciation: (pī'lē-u, pil'ē-u). [key]
the top of the head of a bird, from the base of the bill to the nape.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.