thorium oxide

thoria

[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.


Origin:
1835–45; thori(um) + -a4

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thoria (ˈθɔːrɪə)
 
n
another name for thorium dioxide
 
[C19: thorium + -a, on the model of magnesia]

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