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umbonal

 - 2 dictionary results

um⋅bo⋅nal

  [uhm-buh-nl]
Use umbonal in a Sentence
–adjective
1. having the shape or appearance of an umbo; bosslike: an umbonal structure.
2. of, pertaining to, or near the umbo: the umbonal region.
Also, um⋅bon⋅ic  [uhm-bon-ik] .

Origin:
1850–55; < L umbōn- (s. of umbō; see umbo ) + -al 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To umbonal
um·bo   (ŭm'bō)   
n.   pl. um·bo·nes (ŭm-bō'nēz) or um·bos

  1. The boss or knob at the center of a shield.

    1. Biology A knoblike protuberance arising from a surface, as the prominence near the hinge of a bivalve shell or the projection at the scale tip of a seed-bearing cone.

    2. Anatomy A small projection at the center of the outer surface of the eardrum.


[Latin umbō, umbōn-; see nobh- in Indo-European roots.]
um'bo·nal (ŭm'bə-nəl, ŭm-bō'nəl), um·bon'ic (ŭm-bŏn'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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