Meaning of arsenic trisulfide

ar'senic trisul'fide

Pronunciation: [key]
— Chem. Chem.
  1. a yellow or red crystalline substance, AsS, occurring in nature as the mineral orpiment, and used as a pigmentand in pyrotechnics.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.