thoria

[ thawr-ee-uh, thohr- ]

/ ˈθɔr i ə, ˈθoʊr- /

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noun Chemistry.

a white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle.

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Also called thorium oxide, thorium dioxide.

Origin of thoria

First recorded in 1835–45; thori(um) + -a⁴

Words nearby thoria

Thorazine, Thoreau, Thoreau, Henry David, Thorez, Thorfinn Karlsefni, thoria, thorianite, thorite, thorium, thorium dioxide, thorium series

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use thoria in a sentence

Thoria which has been ignited is not readily soluble in acids.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
Dissolve; and from the hydrochloric acid solution precipitate the thoria (if any) with ammonium oxalate.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
With thoria the shrinkage is smaller than with any other known substance, and it possesses very high refractory powers.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 6|Various
Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2|Various

British Dictionary definitions for thoria

thoria

/ (ˈθɔːrɪə) /

noun

another name for thorium dioxide

Word Origin for thoria

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