Sentence:  Akin to European soft-paste porcelain, this material, known as <WSD>fritware</WSD> or stone-paste, is described in the fourtheenth-century treatise of Ahu'l Qasim as consisting of ten parts ground quartz, one part ground glass and one part fine white clay. 
Meaning of the word marked with <WSD> tags:  A combination of clay and frit used to create fritware.