umbo

Pronunciation: /ˈʌm.bəʊ/

The English word “umbo” has 4 meanings listed here.

noun

The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike.
An inward projection of 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 cap of a mushroom or toadstool.

Borrowed from Latin umbō (“a shield boss”). Doublet of umbone.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.