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thulia

[thoo-lee-uh]
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noun Chemistry.
  1. a dense, greenish-white powder, TmO3, that on gentle heating exhibits a reddish incandescence: used in the manufacture of thulium metal.

Origin of thulia

First recorded in 1885–90; thuli(um) + -a4
Also called thulium oxide.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018