The Collaborative International Dictionary of English v.0.48:

Eyetooth \Eye"tooth\ ([imac]"t[=oo]th`), n.; pl. Eyeteeth
   ([imac]"t[=e]th`) (Anat.)
   A canine tooth of the upper jaw. See Teeth.
   [1913 Webster]

   To cut one's eyeteeth, to become acute or knowing.
      [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

eyetooth
    n 1: one of the four pointed conical teeth (two in each jaw)
         located between the incisors and the premolars [syn:
         canine, canine tooth, eyetooth, eye tooth,
         dogtooth, cuspid]