Thoria
noun, Chemistry.
1.
a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.
noun
1.
another name for thorium dioxide
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- Thorianite
noun 1. a rare mineral, mainly thoria, ThO 2 , but also containing uranium, cerium, and other rare-earth metals, occurring in small, black, cubic crystals: notable for its radioactivity and used as a minor source of thorium. noun 1. a rare black mineral consisting of thorium and uranium oxides. Formula: ThO2.U3O8
- Thoric
noun, Chemistry. 1. a grayish-white, lustrous, somewhat ductile and malleable, radioactive metallic element present in monazite: used as a source of nuclear energy, as a coating on sun-lamp and vacuum-tube filament coatings, and in alloys. Symbol: Th; atomic weight: 232.038; atomic number: 90; specific gravity: 11.7. noun 1. a soft ductile silvery-white metallic element. It […]
- Thorite
noun 1. a rare mineral, thorium silicate, ThSiO 4 , occurring in the form of yellow or black crystals. noun 1. a yellow, brownish, or black radioactive mineral consisting of tetragonal thorium silicate. It occurs in coarse granite and is a source of thorium. Formula: ThSiO4
- Thorium
noun, Chemistry. 1. a grayish-white, lustrous, somewhat ductile and malleable, radioactive metallic element present in monazite: used as a source of nuclear energy, as a coating on sun-lamp and vacuum-tube filament coatings, and in alloys. Symbol: Th; atomic weight: 232.038; atomic number: 90; specific gravity: 11.7. noun 1. a soft ductile silvery-white metallic element. It […]
- Thorium-series
noun, Chemistry. 1. the radioactive series that starts with thorium and ends with a stable isotope of lead of mass number 208. thorium series noun 1. a radioactive series that starts with thorium-232 and ends with lead-208