thu·li·um /ˈθuliəm, ˈθju-/
 稀土金屬元素,符號Tm,銩原子序69
 thu·li·um /ˈθ(j)ulɪəm/ 名詞
 銩
 Thu·li·um n.  Chem. A rare metallic element of the lanthanide group having atomic number 69, and atomic weight 168.93.  It is found in the mineral gadolinite and other minerals, together with other rare earths.  For more information see the data from ChemGlobe.
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 thulium
      n : 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 [syn: Tm, atomic number 69]
 thulium
 Symbol: Tm
 Atomic number: 69
 Atomic weight: 168.934
 Soft grey metallic element that belongs to the lanthanoids. One natural
 isotope exists, Tm-169, and seventeen artificial isotopes have been
 produced. No known uses for the element. Discovered in 1879 by Per Theodor
 Cleve.