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| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
| thorium dioxide |
| NOUN: | A heavy white powder, ThO2, obtained from monazite and used mainly in ceramics, glass, and gas mantles and as a catalyst. Also called thoria. |
| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. | |
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