pro·to·porcelain | \ ¦prōt(ˌ)ō+ \
Definition of protoporcelain
: a porcelaneous ware lacking some of the qualities of a true porcelain specifically : a hard-fired gray kaolinic Chinese stoneware known since the Han dynasty
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Time Traveler for protoporcelain
The first known use of protoporcelain was in 1904
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