umbo
/ˈʌm.bəʊ/noun
Elementary
1
The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike.
2
An inward projection of the tympanic membrane of the ear.
3
One of the lateral prominences just above the hinge of a bivalve shell.
4
A bump or protrusion on the cap of a mushroom or toadstool.
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