Source : Webster's Revised Unabridged Dictionary (1913)

Odontoblast \O*don"to*blast\, n. [Odonto- + -blast.]
   1. (Anat.) One of the more or less columnar cells on the
      outer surface of the pulp of a tooth; an odontoplast. They
      are supposed to be connected with the formation of
      dentine.

   2. (Zo["o]l.) One of the cells which secrete the chitinous
      teeth of Mollusca.