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umbo

Umbo is a 4 letter word which starts with the letter U and ends with the letter O for which we found 3 definitions.

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