umbo plural
um·bo
The plural form of umbo is umbones
U uDefinitions
- noun plural umbo a boss on a shield, as one at the center of a circular shield. 1
- noun plural umbo any similar boss or protuberance. 1
- noun plural umbo Zoology. the beak of a bivalve shell; the protuberance of each valve above the hinge. 1
- noun plural umbo Anatomy. the depressed area on the outer surface of the tympanic membrane. 1
- noun plural umbo a blunt or rounded protuberance arising from a surface, as on a pine cone scale. 1