Pronunciation: (ôr'i-kul), [key]
a. the projecting outer portion of the ear; pinna.
b. Also called auricular appendage. an ear-shaped appendage projecting from each atrium of the heart.
c. (loosely) the atrium.
2. Bot., Zool.a part like or likened to an ear.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.