From The Collaborative International Dictionary of English v.0.48:

Kaolin \Ka"o*lin\, Kaoline \Ka"o*line\, n. [Chin. kao-ling.]
   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]
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