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n 1  :  a trivalent and pentavalent solid poisonous element that is commonly metallic steel-gray, crystalline, and brittle - symbol As - see ELEMENTtable    2  :  ARSENIC TRIOXIDE
adj :  of, relating to, or containing arsenic esp. with a valence of five .

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North Big Horn Hospital District (Lovell, Wyoming - Big Horn County)