UMBONES

UMBO

umbo

(noun) a slight rounded elevation where the malleus attaches to the eardrum

Source: WordNet® 3.1

Noun

umbones

plural of umbo

Source: Wiktionary

UMBO

Um"bo, n.; pl. L. Umbones, E. Umbos. Etym: [L.]

1. The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.

2. A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.

3. (Zoöl.)

Definition: One of the lateral prominence just above the hinge of a bivalve shell.

Source: Webster’s Unabridged Dictionary 1913 Edition