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From: WordNet (r) 2.0

 atomic number 34
      n : a toxic nonmetallic element related to sulfur and tellurium;
          occurs in several allotropic forms; a stable gray
          metallike allotrope conducts electricity better in the
          light than in the dark and is used in photocells; occurs
          in sulfide ores (as pyrite) [syn: selenium, Se]