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Umbo
(n.)
The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
Umbo
(n.)
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.
Umbo
(n.)
One of the lateral prominence just above the hinge of a bivalve shell.