umbo

Etymology
Borrowed from.

Noun

 * 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.
 * 3)  An inward projection of the tympanic membrane of the ear.
 * 4)  One of the lateral prominences just above the hinge of a bivalve shell.
 * 5)  A bump or protrusion on the cap of a mushroom or toadstool.
 * 1)  One of the lateral prominences just above the hinge of a bivalve shell.
 * 2)  A bump or protrusion on the cap of a mushroom or toadstool.

Etymology
From, from the root. Cognate with 🇨🇬.

Noun

 * 1) boss (of a shield etc.)
 * 2) elbow (or similar projecting part)

Etymology
From.

Noun

 * 1) shape, form, structure