[thawr-ee-uh, thohr-]
noun Chemistry.
a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.
Also called thorium oxide, thorium dioxide.

1835–45; thori(um) + -a4 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thoria (ˈθɔːrɪə)
another name for thorium dioxide
[C19: thorium + -a, on the model of magnesia]

Collins English Dictionary - Complete & Unabridged 10th Edition
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