ameloblast
noun
am·e·lo·blast ˈa-mə-lō-ˌblast 
: one of a group of columnar epithelial cells that produce and deposit enamel on the surface of a developing vertebrate tooth
Word History
Etymology
obsolete amel enamel (Middle English, ultimately from Old French esmail) + -o- + -blast — more at enamel
First Known Use
1878, in the meaning defined above
Medical Definition
ameloblast
noun
am·e·lo·blast ˈam-ə-lō-ˌblast
: any of a group of columnar epithelial cells that produce and deposit enamel on the surface of a developing vertebrate tooth