Or'pi-ment, n.

n. [Fr. orpiment, orpin, It. orpimento, Sp. oropimento, Pg. ouropimento, Pr. auripimen, auripimen, aurpigment, Lat. auripigmentum, from aurum, gold, and pigmentum, pigment.] The trisulphide of arsenic, occurring in crystals of a lemon-yellow color, and having a resinous taste. It occurs in nature, as an ore of arsenic, and usually in combination with realgar. Orpiment is used in dyeing.

Red orpiment, realgar; the red sulphuret of arsenic.—Yellow orpiment, king's yellow.