GNU Collaborative International Dictionary of English

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1.       
   Orpiment , n. [F., fr. L. auripigmentum; aurum gold + pigmentum pigment.  Cf. Aureate, Pigment, Orpin, Orpine.] (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.
   1913 Webster
   Our orpiment and sublimed mercurie.
   Chaucer.
   
   1913 Webster
   Red orpiment, realgar; the red sulphide of arsenic. -- Yellow orpiment, king's yellow.
   1913 Webster