Arsenic-trioxide definition

ärsə-nĭk
A poisonous, white amorphous powder, As2 O3 , used in insecticides, rat poisons, weed killers, pigments, and preservatives for hides and wood.
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An industrially important oxide of arsenic that occurs as the mineral claudetite; formula As2O3 (though in liquid, gaseous and some solid forms it has molecules of the form As4O6).
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