SG Heritage Dictionary

Umbo [Noun] Webster's Dictionary 1828

The boss or protuberant part of a shield.

Umbo [Noun] Webster's Dictionary 1913

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 larvae of echinoderms or in the tympanic membrane of the ear.

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

Umboldilite [Noun] Webster's Dictionary 1828

A newly discovered Vesuvian mineral, whose primitive form is a right rectangular prism, with a square base, its color brown, inclining to yellowish or greenish yellow.

Umbonate [Adjective] Webster's Dictionary 1913

Alt. of Umbonated

Umbonated [Adjective] Webster's Dictionary 1913

Having a conical or rounded projection or protuberance, like a boss.

Umbones [Plural] Webster's Dictionary 1913

of Umbo

Umbos [Plural] Webster's Dictionary 1913

of Umbo