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The following 3 entries include the term cassius.
Cassius purple
noun: purple of cassius
purple of Cassius
: a purple pigment prepared usually by precipitation from solutions of gold chloride and stannous chloride, consisting of colloidal gold and stannic oxide, and used chiefly in coloring ceramic glazes and ruby glass and in a very delicate test for gold
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Merriam-Webster unabridged