| 翻訳と辞書 | 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 of echinoderms or in the tympanic membrane of the ear.
 3. (Zol.) One of the lateral prominence just above the hinge of a bivalve shell.
 
 
 
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