• Webster's Revised Unabridged Dictionary
    • n Depolishing (Ceramics) The process of removing the vitreous glaze from porcelain, leaving the dull luster of the surface of ivory porcelain.
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Century Dictionary and Cyclopedia
    • n depolishing The process of removing polish or glaze; specifically, in ceramics, a process whereby the glaze on ware is removed. Ware with the resulting dull surface is called ivory porcelain. It corresponds to the deglazing of glass.
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In literature:

We can, however, go far beyond the mere depolishing of glass; indeed I have already said that quartz-sand can wear a hole through corundum.
"Fragments of science, V. 1-2" by John Tyndall