umbonal

Variant of umbo

umbo definition

umbo (um′bō)

noun pl. umbones um·bo′·nes (um bō′nēz) or umbos um′·bos

  1. the boss, or knob, at the center of a shield
  2. something resembling this; specif.,
    1. the elevation beside the hinge on each half of a bivalve shell
    2. the prominence on the eardrum at the point of attachment of the malleus

Etymology: L, akin to umbilicus, navel

Related Forms:

  • umbonal um′·bo·nal (-bə nəl) adjective or umbonate um′·bo·nate (-nit, -nāt′) or umbonic um·bon′ic (um bän′ik)

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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