Dictionary
u•ni•cos•tate
Pronunciation: (yOO"ni-kos'tāt, -kô'stāt), [key]—
adj.
1. having only one costa, rib, or ridge.
2. Bot.(of a leaf) having only one primary or prominent rib, the midrib.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.