One of the mysteries of the English language finally explained.
A type of early stoneware with a feldspathic glaze, closely resembling true porcelain but lacking its translucent qualities; especially a ceramic ware produced in ancient China under the Han dynasty (206 b.c.–a.d. 220). Also as a count noun: an item made of this.
Early 20th century. From proto- + porcelain.
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