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From: Webster's Revised Unabridged Dictionary (1913)

 Or·pi·ment n.  Chem. Arsenic sesquisulphide, produced artificially as an amorphous lemon-yellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment.  It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing.
    Our orpiment and sublimed mercurie.   --Chaucer.
 Red orpiment, realgar; the red sulphide of arsenic.
 Yellow orpiment, king's yellow.
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