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arsenic trisulfide

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noun Chemistry.

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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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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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. 2021

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