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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   atomic number 33
       n 1: 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 [syn: arsenic, As, atomic
    number 33]