Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A highly radioactive blackish, greenish, or yellow mineral, ThO2, isomorphous with uraninite.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A radioactive mineral containing thorium dioxide (ThO2) plus oxides of uranium, lanthanum, cerium neodymium and praseodymium in smaller quantities.

from The Century Dictionary and Cyclopedia

  • n. A mineral found in alluvial gravel near Kondurugala, in the province of Sabaragamuwa, and in the Galle district, Ceylon.

Etymologies

thoria + -an2 + -ite1.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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