calcium arsenate

noun

: an arsenate of calcium [as the normal tricalcium arsenate Ca₃(AsO₄)₂ or a basic salt 3Ca₃(AsO₄)₂·Ca(OH)₂]

especially : a commercial mixture obtained as a white powder usually by heating arsenic pentoxide and calcium hydroxide in water and used as an insecticide especially in the form of a dust

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