Tusk (?), v. i. To bare or gnash the teeth. [Obs.]

Tusk (?), n. (Zoöl.) Same as Torsk.

Tusk, n. [OE. tusk, the same word as tusch, AS. tusc. See Tush a tooth.] 1. (Zoöl.) One of the elongated incisor or canine teeth of the wild boar, elephant, etc.; hence, any long, protruding tooth.

2. (Zoöl.) A toothshell, or Dentalium; -- called also tusk-shell.

3. (Carp.) A projecting member like a tenon, and serving the same or a similar purpose, but composed of several steps, or offsets. Thus, in the illustration, a is the tusk, and each of the several parts, or offsets, is called a tooth.