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18.117.101.7
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1 definition found

From: WordNet (r) 2.0

 atomic number 81
      n : a soft gray malleable metallic element that resembles tin
          but discolors on exposure to air; it is highly toxic and
          is used in rodent and insect poisons; occurs in zinc
          blende and some iron ores [syn: thallium, Tl]