noun, plural umbones [uhm-boh-neez] , umbos.
a boss on a shield, as one at the center of a circular shield.
any similar boss or protuberance.
Zoology. the beak of a bivalve shell; the protuberance of each valve above the hinge.
Anatomy. the depressed area on the outer surface of the tympanic membrane.
a blunt or rounded protuberance arising from a surface, as on a pine cone scale.

1715–25; < Latin umbō boss (of a shield), knob, projecting part; akin to umbilīcus (see umbilicus) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To umbones
World English Dictionary
umbo (ˈʌmbəʊ)
n , pl umbones, umbos
1.  a small hump projecting from the centre of the cap in certain mushrooms
2.  a hooked prominence occurring at the apex of each half of the shell of a bivalve mollusc
3.  anatomy the slightly convex area at the centre of the outer surface of the eardrum, where the malleus is attached on the internal surface
4.  a large projecting central boss on a shield, esp on a Saxon shield
[C18: from Latin: boss of a shield, projecting piece]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
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.
Cite This Source
Related Words
Related Searches
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature