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. 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

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

From Project Gutenberg

In other words, it is easier to accelerate the motion of the corpuscles in ceria, thoria and the other ingredients of the mantle, than it is those of carbon.

From Project Gutenberg

The specific gravity of pure thoria is 10.2207 to 10.2198.

From Project Gutenberg

Metallic thorium is brittle and almost infusible; the powder takes a metallic luster under pressure, is permanent in the air at temperatures up to 120°, takes fire below a red heat either in air or oxygen, and burns with a dazzling luster, leaving a residue of perfectly white thoria.

From Project Gutenberg

It is then weighed as thoria, ThO2.

From Project Gutenberg