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(historical) The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike. / (anatomy) An inward projection of the tympanic membrane of the ear.

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umbo

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umbo

/ˈʌm.bəʊ/

noun

(historical) The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike. / (anatomy) An inward projection of the tympanic membrane of the ear.