D defs.my
Entry 1 sense Webster, 1913

Kaolin

/koul'-ĭn/ · Ka·o·lin · IPA /ˈkeɪ.ə.lɪn/
01 n. 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…
  1. 1.
    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.(Min.)