umbo
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.
Origin of umbo
1Words Nearby umbo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use umbo in a sentence
One species (C. discors) is pale green, with radiating lines from umbo to margin.
The Sea Shore | William S. FurneauxThe hand was protected by a hollow conical boss or umbo, fixed to the wood by its brim, but projecting considerably.
Beowulf | R. W. ChambersIt is a light pelagic form, with paper-like plates and angularly bent carina, with a prominent umbo.
One is in the Spanish-Moorish style and of a convex shape, with iron bordering and umbo, and a lining of yellow brocade.
The Arts and Crafts of Older Spain, Volume I (of 3) | Leonard WilliamsThe paracentesis knife is inserted boldly through the membrane a little behind and above the umbo.
British Dictionary definitions for umbo
/ (ˈʌmbəʊ) /
a small hump projecting from the centre of the cap in certain mushrooms
a hooked prominence occurring at the apex of each half of the shell of a bivalve mollusc
anatomy the slightly convex area at the centre of the outer surface of the eardrum, where the malleus is attached on the internal surface
a large projecting central boss on a shield, esp on a Saxon shield
Origin of umbo
1Derived forms of umbo
- umbonate (ˈʌmbənɪt, -ˌneɪt), umbonal (ˈʌmbənəl) or umbonic (ʌmˈbɒnɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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