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 (Th O 2) plus oxides ofuranium ,lanthanum ,cerium neodymium andpraseodymium in smaller quantities.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[thoria + –an + –ite.]
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Examples
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