Source : Webster's Revised Unabridged Dictionary (1913)

Incisor \In*ci"sor\ (?; 277), n. [NL.] (Anat.)
   One of the teeth in front of the canines in either jaw; an
   incisive tooth. See {Tooth}.

Incisor \In*ci"sor\, a.
   Adapted for cutting; of or pertaining to the incisors;
   incisive; as, the incisor nerve; an incisor foramen; an
   incisor tooth.

Source : WordNet®

incisor
     n : a tooth for cutting or gnawing; located in the front of the
         mouth in both jaws