Meaning of umbo | Babel Free

Definitions

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

Examples

“It is thirteen inches diameter, made of wood covered with leather, and an iron plate decorated with nails and mouldings; the boss or umbo projects four inches.”

“serves as the umbo of the region’s so-called Silicon Shield”

CEFR level