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From The Collaborative International Dictionary of English v.0.48:
Cassius \Cas"sius\, 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]