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thoria

[thawr-ee-uh, thohr-] /ˈθɔr i ə, ˈθoʊr-/
noun, Chemistry
1.
a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.
Also called thorium oxide, thorium dioxide.
Origin
1835-1845
1835-45; thori(um) + -a4
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thorium-dioxide

thoria

/ˈθɔːrɪə/
noun
1.
another name for thorium dioxide
Word Origin
C19: thorium + -a, on the model of magnesia
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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