Underglaze a. : Applied under the glaze, that is, before the glaze, that is, before the glaze is put on; fitted to be so applied; -- said of colors in porcelain painting.

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Taxonomy
free encyclopedia, Hamer, underglaze blue printing, glaze, Illustrated Dictionary of Practical Pottery, glass science, search, glost, firing, colours, fuse, Fournier, Robert, Van Nostrand Reinhold, Frank, The Potter's Dictionary of Materials and Techniques, A&C Black, University of Pennsylvania Press.

Defination from the web:
Underglaze is a method of decorating ceramic articles, the decoration is applied to the surface before it is glazed. ... about underglaze blue printing in the North Staffordshire pottery industry. Underglaze painting of ... Retrieved from "http://en.wikipedia.org/wiki/Underglaze" ...