Definitions of umbo
The word umbo uses 4 letters:bmou.
UMBO is playable in:
n. - The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike. 2
n. - A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvae of echinoderms or in the tympanic membrane of the ear. 2
n. - One of the lateral prominence just above the hinge of a bivalve shell. 2