auripigment

Orpiment \Or"pi*ment\, 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]
    

Auripigment \Au`ri*pig"ment\ ([add]`r[i^]*p[i^]g"ment), n.
   See {Orpiment}. [Obs.]
   [1913 Webster]