[1] : 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
see also:
purple of cassius 

[2] : WordNet (r) 2.0

cassius
     n : prime mover in the conspiracy against julius caesar died in
         42 bc syn: cassius longinus, gaius cassius longinus
see also:
cassius longinus gaius cassius longinus 

Cassius >> C Words
Cassius, definition of term: Cassius
cassius_pag1.html