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Noun
arsenic
arsenic trioxide
arsenous anhydride
arsenous oxide
white arsenic
ratsbane
Definition: a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
Definition: 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).