arsenic

Noun
  1. A white powdered poisonous trioxide of arsenic;
    Used in manufacturing glass and as a pesticide (rat poison) and weed killer (synset 114792380)
  2. 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 (synset 114653327)

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