arsenic trioxide

noun Chemistry.
a white, tasteless, amorphous, slightly water-soluble, poisonous powder, As 2 O 3 , used chiefly in the manufacture of pigments and glass and as an insecticide or weed-killer; arsenous acid.
Also called arsenic.
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arsenic trioxide
 
n
Also called: arsenic a white poisonous powder used in the manufacture of glass and as an insecticide, rat poison, and weedkiller. Formula: As2O3

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Nearly all domestic imports were in compound form, primarily as arsenic trioxide, although some arsenic metal was also imported.
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