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Arsenic trisulfide, As2S3, a yellow mineral used as a pigment.
[Middle English, from Old French, from Latin auripigmentum : aurum, gold + pigmentum, pigment; see pigment.]
(Minerals) a yellow mineral consisting of arsenic trisulphide in monoclinic crystalline form occurring in association with realgar: it is an ore of arsenic. Formula: As2S3
[C14: via Old French from Latin auripigmentum gold pigment]
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|Noun||1.||orpiment - a yellow mineral occurring in conjunction with realgar; an ore of arsenic|
As, atomic number 33, arsenic - a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition