GNU Collaborative International Dictionary of English

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1.       
   Cassius , n. [From the name of the discoverer, A. Cassius, a German physician of the 17th centry.] A brownish purple pigment, obtained by the action of some compounds of tin upon certain salts of gold. It is used in painting and staining porcelain and glass to give a beautiful purple color. Commonly called Purple of Cassius.
   1913 Webster