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arsenic disulfide

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noun Chemistry.
  1. an orange-red, water-insoluble, poisonous powder, As4S4, As2S2, or AsS, used chiefly in the manufacture of fireworks.
Also called ar·senic mon·o·sul·fide [mon-uh-suhl-fahyd] /ˌmɒn əˈsʌl faɪd/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018