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Umbo 1

Definition: The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.

Umbo 2

Definition: 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 3

Definition: One of the lateral prominence just above the hinge of a bivalve shell.

umbo 4

Definition: a slight rounded elevation where the malleus attaches to the eardrum

 

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