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From The Collaborative International Dictionary of English v.0.48:
Odontoblast \O*don"to*blast\, n. [Odonto- + -blast.] [1913 Webster] 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. [1913 Webster] 2. (Zool.) One of the cells which secrete the chitinous teeth of Mollusca. [1913 Webster]