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umbones |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Umbo \Um"bo\, n.; pl L. {Umbones}, E. {Umbos}. [L.] 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 larv[ae] of echinoderms or in the tympanic membrane of the ear. 3. (Zo["o]l.) One of the lateral prominence just above the hinge of a bivalve shell.
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