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 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.


© Webster 1913.

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