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thorium dioxide

 - 3 dictionary results

tho⋅ri⋅a

  [thawr-ee-uh, thohr-]
Use thorium dioxide in a Sentence
–noun Chemistry.
a white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles, as the Welsbach gas mantle.
Also called thorium oxide, thorium dioxide.

Origin:
1835–45; thori(um) + -a 4
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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thorium dioxide  
n.  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 © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: thorium dioxide
Function: noun
: a refractory crystalline compound obtained usually as a dense white powder and formerly used as a contrast medium inradiography called also thorium oxide, thorotrast
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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