thoria

[ thawr-ee-uh, thohr- ]

noun

, Chemistry.

1. a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.

thoria

/ ˈθɔːrɪə /

noun

1. See thorium dioxide
   another name for thorium dioxide

Word History and Origins

Origin of thoria¹

First recorded in 1835–45; thori(um) + -a ⁴

Word History and Origins

Origin of thoria¹

C19: thorium + -a, on the model of magnesia

Example Sentences

Thoria which has been ignited is not readily soluble in acids.

From Project Gutenberg

Dissolve; and from the hydrochloric acid solution precipitate the thoria (if any) with ammonium oxalate.

From Project Gutenberg

With thoria the shrinkage is smaller than with any other known substance, and it possesses very high refractory powers.

From Project Gutenberg

Much the best practical source of helium is thorianite, a mineral imported from Ceylon for the manufacture of thoria.

From Project Gutenberg