The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
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.
One of the lateral prominence just above the hinge of a bivalve shell.
convex shape generic term, convexity generic term
Vogais: uo
Consoantes: mb
umbe, unbow, unboy, umhofo, ump, unbe, unbay, unhoop, unpope, unhap.