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Meaning of umbonate

um•bo•nate

Pronunciation: (um'bu-nit, -nāt"), [key]
— adj.
  1. having an umbo or projecting boss.
  2. shaped like an umbo; having a rounded convex form: an umbonate fungus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.