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Noun: Th
  1. A soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
    - thorium, atomic number 90
  2. The fifth day of the week; the fourth working day
    - Thursday

Type of: metal, metallic element, weekday

Part of: monazite, thorite

Encyclopedia: Th