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1. (n.) umbo
a boss on a shield.
2. umbo
any similar boss or protuberance.
3. umbo
the beak of a bivalve shell; the protuberance of each valve above the hinge.
4. umbo
the raised area on the inner surface of the tympanic membrane, where the malleus is attached.
Etymology: (1715–25; < L umbō; akin to umbilīcus (see umbilicus ))
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| Definition of 'umbo' |
Princeton's WordNet |
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1. (noun) umbo
a slight rounded elevation where the malleus attaches to the eardrum
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| Definition of 'umbo' |
Webster Dictionary |
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1. (noun) umbo
the boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike
2. (noun) umbo
a boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvae of echinoderms or in the tympanic membrane of the ear
3. (noun) umbo
one of the lateral prominence just above the hinge of a bivalve shell
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Definitions of umbo 
