- 1. n. The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike. Source: opted
- 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. Source: opted
- 3. n. One of the lateral prominence just above the hinge of a bivalve shell. Source: opted
- 4. n. a slight rounded elevation where the malleus attaches to the eardrum Source: wordnet
- 5. 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.) One of the lateral prominence just above the hinge of a bivalve shell. Source: webster
- 6. One of the lateral prominence just above the hinge of a bivalveshell. Source: adambom
- 7. n. a slight rounded elevation where the malleus attaches to the eardrum Source: ecdict
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