Found 2 items, similar to umbo.
English → English (WordNet) Definition: umbo umbo n : a slight rounded elevation where the malleus attaches to the eardrum [also: umbones (pl)]
English → English (gcide) Definition: Umbo Umbo \Um"bo\, n.; pl. L. Umbones, E. Umbos. [L.] 1. The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike. [1913 Webster] 2. A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larv[ae] of echinoderms or in the tympanic membrane of the ear. [1913 Webster] 3. (Zo["o]l.) One of the lateral prominence just above the hinge of a bivalve shell. [1913 Webster]