Source : Webster's Revised Unabridged Dictionary (1913)

Dentifrice \Den"ti*frice\, n. [L. dentifricium; dens, dentis,
   tooth + fricare to rub: cf. F. dentifrice. See {Tooth}, and
   {Friction}.]
   A powder or other substance to be used in cleaning the teeth;
   tooth powder.

Source : WordNet®

dentifrice
     n : a substance for cleaning the teeth; applied with a
         toothbrush