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From The Collaborative International Dictionary of English v.0.48:
Kaolin \Ka"o*lin\, Kaoline \Ka"o*line\, n. [Chin. kao-ling.] (Min.) A very pure white clay, ordinarily in the form of an impalpable powder, and used to form the paste of porcelain; China clay; porcelain clay. It is chiefly derived from the decomposition of common feldspar. [1913 Webster] Note: The name is now applied to all porcelain clays which endure the fire without discoloration. [1913 Webster]