TUSK (2)

Tusk, n. [[OE. tusk, the same word as tusch, AS. tusc. See Tush a tooth.]] 1. 1. (Zoöl.) One of the elongated incisor or canine teeth of the wild boar, elephant, etc.; hence, any long, protruding tooth.
2. 2. (Zoöl.) A toothshell, or Dentalium; — called also tusk-shell.
3. 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.