tusk /ˈtʌsk/
  牙,暴牙,牙狀物(vt.)以牙刺戳,以牙掘,用牙碰傷
  tusk /ˈtəsk/ 名詞
  長牙,獠牙,長尖牙
  Tusk, n.
  1. Zool. One of the elongated incisor or canine teeth of the wild boar, elephant, etc.; hence, any long, protruding tooth.
  2. Zool. 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.
  Tusk v. i. To bare or gnash the teeth. [Obs.]
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  tusk
       n 1: a hard smooth ivory colored dentine that makes up most of
            the tusks of elephants and walruses [syn: ivory]
       2: a long pointed tooth specialized for fighting or digging;
          especially in an elephant or walrus or hog
       v 1: stab or pierce with a horn or tusk; "the rhino horned the
            explorer" [syn: horn]
       2: remove the tusks of animals; "tusk an elephant" [syn: detusk]