Illustration of umbo
- U umbo 1
umbo
noun
um·bo ˈəm-(ˌ)bō 
plural umbones ˌəm-ˈbō-(ˌ)nēz or umbos
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
umbonal
ˈəm-bə-nᵊl ˌəm-ˈbō-
adjective ˌəm-ˈbō- umbonate
ˈəm-bə-ˌnāt ˌəm-ˈbō-nət
adjective ˌəm-ˈbō-nət 
Word History
Etymology
Latin; akin to Latin umbilicus — more at navel
First Known Use
1721, in the meaning defined at sense 1
Medical Definition
umbo
noun
um·bo ˈəm-(ˌ)bō
plural umbones ˌəm-ˈbō-(ˌ)nēz or umbos
or umbos : an elevation in the tympanic membrane of the ear
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