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king's yellow

noun Chemistry.
  1. See under arsenic trisulfide.
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arsenic trisulfide

noun Chemistry.
  1. a yellow or red crystalline substance, As2S3, occurring in nature as the mineral orpiment, and used as a pigment (king's yellow) and in pyrotechnics.
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Origin of arsenic trisulfide

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018