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From: WordNet (r) 2.0

 GD
      n 1: a nerve agent easily absorbed into the body; a lethal
           cholinesterase inhibitor that is highly toxic when
           inhaled [syn: soman]
      2: a ductile silvery-white ductile ferromagnetic trivalent
         metallic element of the rare earth group [syn: gadolinium,
          atomic number 64]