What is the meaning of Umbo?

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.

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

An inward projection of the tympanic membrane of the ear.

One of the lateral prominences just above the hinge of a bivalve shell.

A bump or protrusion on the cap of a mushroom or toadstool.

boss (of a shield etc.)

elbow (or similar projecting part)

shape, form, structure

Source: wiktionary.org