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noun, plural um·bo·nes 
[uhm-boh-neez] , um·bos.
[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; < Latin umbō boss (of a shield), knob, projecting part; akin to umbilīcus (see umbilicus)
1715–25; < Latin 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. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Umbo
is always a great word to know.
So is reptile. Does it mean:
| having a backbone or spinal column |
| cold-blooded vertebrate such as turtles, snakes, lizards, crocodilians, amphisbaenians and tuatara |
Collins
World English Dictionary
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
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