from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A bright, silvery rare-earth element obtained commercially from monazite, having an x-ray emitting isotope that is used in small portable medical x-ray units. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,727°C; specific gravity 9.3; valence 2, 3. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a metallic chemical element (symbol Tm) with an atomic number of 69.

from the GNU version of the Collaborative International Dictionary of English

  • n. A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.

from The Century Dictionary and Cyclopedia

  • n. The name was given in 1879, by Cleve, to a supposed new element present in the compounds of Mosandu' s erbium extracted from gadolinite. The evidence of its existence was found in an examination of the absorption-spectra of products of the fractionation of erbium salt solutions, but it is very doubtful whether the separation is complete and whether thulium is to be considered as a distinct and single element.
  • n. A supposed element found in the mineral gadolinite. Its properties have not been ascertained, and its existence is doubtful.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • 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


After Thule 1.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Thule (as a poetic way to say Scandinavia) + -ium (Wiktionary)


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  • Rare-earth elements include the relatively common cerium, used in pollution-control equipment, and terbium, used in energy efficient light bulbs, as well as the truly rare thulium, which has applications in x-ray devices.

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  • Of the rare-earth metals many - yttrium, terbium, erbium, ytterbium, scandium, thulium, holmium - have been given names that show their origin in various Swedish localities.

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  • Swedish chemist and geologist who discovered the elements holmium and thulium.


  • China accounts for 95 per cent of global production and about 60 per cent of consumption of rare metals, including dysprosium, terbium, thulium, lutetium and yttrium, according to the US Geological Survey.

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  • Minerals like calcium, zinc, copper, manganese iron, terbium, thulium and neodymium will help in the proper functioning of our metabolism.



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