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A poisonous, white amorphous powder, As2O3, used in insecticides, rat poisons, weed killers, pigments, and preservatives for hides and wood.
(Elements & Compounds) a white poisonous powder used in the manufacture of glass and as an insecticide, rat poison, and weedkiller. Formula: As2O3. Also called: arsenic
a white, tasteless, poisonous powder, As2O3, used chiefly in the manufacture of pigments and glass and as an insecticide or weed-killer.
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|Noun||1.||arsenic trioxide - a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer|
trioxide - an oxide containing three atoms of oxygen in the molecule