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Definitions of thallium
  1. noun
    a soft grey 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

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Definition that contains thallium
  • sir william crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
  • william crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
  • crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
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