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.
n : a yellow mineral occuring in conjunction with realgar; an
ore of arsenic