Orpiment definitions

ôr'pə-mənt
Arsenic trisulfide, As2 S3 , a yellow mineral used as a pigment.
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Arsenic trisulfide, As2S3, having a lemon-yellow color and a resinous luster: it is used as a pigment.
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Arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment.
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Origin of orpiment

Middle English from Old French from Latin auripigmentum aurum gold pigmentum pigment pigment