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Meaning of unicostate

u•ni•cos•tate

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