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thoria

[thawr-ee-uh, thohr-]
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noun Chemistry.
  1. a white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle.
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Origin of thoria

First recorded in 1835–45; thori(um) + -a4
Also called thorium oxide, thorium dioxide.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for thorium dioxide

thorium dioxide

noun
  1. a heavy insoluble white powder used in incandescent mantles. Formula: ThO 2Also called: thoria
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thoria

noun
  1. another name for thorium dioxide
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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