- a white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle.
Origin of thoria
Also called thorium oxide, thorium dioxide.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for thoria
Thoria which has been ignited is not readily soluble in acids.
Dissolve; and from the hydrochloric acid solution precipitate the thoria (if any) with ammonium oxalate.
With thoria the shrinkage is smaller than with any other known substance, and it possesses very high refractory powers.
Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.
- another name for thorium dioxide
C19: thorium + -a, on the model of magnesia