plural umbones
ˌəm-ˈbō-(ˌ)nēz
or umbos
1
: the boss of a shield
2
: a rounded elevation: such as
a
: an inward projection of the tympanic membrane of the ear
b
: one of the lateral prominences just above the hinge of a bivalve shell
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Merriam-Webster unabridged
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