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arsenic, As, atomic number 33 | a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar | |
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arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic, ratsbane | a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer |