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thoria

[ thawr-ee-uh, thohr- ]

noun

, Chemistry.
  1. a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.


thoria

/ ˈθɔːrɪə /

noun

  1. another name for thorium dioxide
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of thoria1

First recorded in 1835–45; thori(um) + -a 4
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Word History and Origins

Origin of thoria1

C19: thorium + -a, on the model of magnesia
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Example Sentences

Thoria which has been ignited is not readily soluble in acids.

Dissolve; and from the hydrochloric acid solution precipitate the thoria (if any) with ammonium oxalate.

With thoria the shrinkage is smaller than with any other known substance, and it possesses very high refractory powers.

Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.

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Thorfinn Karlsefnithorianite