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Answer for the clue "Shield protuberance ", 4 letters:
umbo

Alternative clues for the word umbo

Word definitions for umbo in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Umbo \Um"bo\, n.; pl. L. Umbones , E. Umbos . [L.] 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; as, the umbo ...

WordNet Word definitions in WordNet
n. a slight rounded elevation where the malleus attaches to the eardrum [also: umbones (pl)]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"boss of a shield," 1921, from Latin umbo "shield-boss, knob, projection."

Usage examples of umbo.

The edges were obtuse, the caps fleshy, then corky, smooth, the upper ends not regular, oblique in the form of an umbo or little knob, the pellicles or outside layers thin and easily separated.