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thallium sulfate

or thallous sulfate

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noun Chemistry.

a colorless, crystalline, water-soluble, poisonous solid, Tl2SO4, used chiefly as an insecticide and rodenticide.

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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