orpiment
or.pi.ment \'o.r-p*-m*nt\ n [ME, fr. MF, fr. L auripigmentum, fr. aurum + pigmentum pigme]nt : orange to lemon yellow arsenic trisulfide As2S3 found as a m ineral or produced artificially and used as a pigment
Webster's English Dictionaryor.pi.ment \'o.r-p*-m*nt\ n [ME, fr. MF, fr. L auripigmentum, fr. aurum + pigmentum pigme]nt : orange to lemon yellow arsenic trisulfide As2S3 found as a m ineral or produced artificially and used as a pigment