Definition of porcelain
1
: a hard, fine-grained, sonorous, nonporous, and usually translucent and white ceramic ware that consists essentially of kaolin, quartz, and a feldspathic rock and is fired at a high temperature
— called also hard-paste porcelain, true porcelain
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Merriam-Webster unabridged
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Time Traveler for porcelain
The first known use of porcelain was circa 1530
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