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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.

Origin of arsenic trisulfide

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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