Category:Orpiment

Or"pi*ment, n. Etym: [f., fr. L. auripigmentum; aurum gold + Pigmentum pigment. Cf. Aureate, pigment, orpin, orpine.] (chem.)

Defn: arsenic sesquisulphide, produced artificially as an amorphous Lemonyellow 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.