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Noun: Tm
  1. A soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime
    - thulium, atomic number 69

Type of: metal, metallic element

Part of: apatite, monazite, xenotime

Encyclopedia: Tm

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to
to a fault