Source : Webster's Revised Unabridged Dictionary (1913)

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}.

Source : WordNet®

Cassius
     n : prime mover in the conspiracy against Julius Caesar (died in
         42 BC) [syn: {Cassius Longinus}, {Gaius Cassius Longinus}]