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umbo

 - 4 dictionary results

um⋅bo

  [uhm-boh]
Use umbo in a Sentence
–noun, plural um⋅bo⋅nes  [uhm-boh-neez] , um⋅bos.
1. a boss on a shield, as one at the center of a circular shield.
2. any similar boss or protuberance.
3. Zoology. the beak of a bivalve shell; the protuberance of each valve above the hinge.
4. Anatomy. the depressed area on the outer surface of the tympanic membrane.
5. a blunt or rounded protuberance arising from a surface, as on a pine cone scale.
Origin:
1715–25; < L umbō boss (of a shield), knob, projecting part; akin to umbilīcus (see umbilicus )
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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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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Medical Dictionary

Main Entry: um·bo
Pronunciation: '&m-(")bO
Function: noun
Inflected Form: plural um·bo·nes /"&m-'bO-(")nEz/ or umbos
: an elevation in the tympanic membrane of the ear
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

umbo um·bo (ŭm'bō)
n. pl. um·bos or um·bo·nes (ŭm-bō'nēz)
A small anatomical projection on a surface, such as that on the inner surface of the tympanic membrane at the end of the manubrium of the malleus, corresponding to the most depressed point of the membrane.

um'bo·nal (ŭm'bə-nəl, ŭm-bō'nəl) or um·bon'ic (ŭm-bŏn'ĭk) adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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