n.
Pronunciation: ' ə m-( ˌ )b ō
Function: noun
Inflected Form: plural um · bo · nes \ ˌ ə m- ' b ō -( ˌ )n ē z \ or umbos
Etymology: Latin; akin to Latin umbilicus ― more at NAVEL
Date: 1721
1 : the boss of a shield
2 : a rounded elevation: 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
– um · bo · nal \ ' ə m-b ə -n ə l, ˌ ə m- ' b ō - \ adjective
– um · bo · nate \ ' ə m-b ə - ˌ n ā t, ˌ ə m- ' b ō -n ə t \ adjective
U umbo 1