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The Collaborative International Dictionary

Tusk \Tusk\, n. [OE. tusk, the same word as tusch, AS. tusc. See Tush a tooth.]

  1. (Zo["o]l.) One of the elongated incisor or canine teeth of the wild boar, elephant, etc.; hence, any long, protruding tooth.

  2. (Zo["o]l.) 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.