Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

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

[thoria + –an + –ite.]

Examples

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