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umbo
noun
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane. For example the umbo in the integument of the larvæ of echinoderms or…
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ˈʌm.bəʊ
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noun
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane. For example the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.
One of the lateral prominences just above the hinge of a bivalve shell.
A bump or protrusion on the top of the cap.
The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.