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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Um·bo n.; pl. L. Umbones E. Umbos
 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. Zool. One of the lateral prominences just above the hinge of a bivalve shell.
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