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1. The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike. 2. 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. One of the lateral prominence just above the hinge of a bivalve shell. 4. a slight rounded elevation where the malleus attaches to the eardrum 
Related wordsconvex shape eardrum |
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