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thoria

 - 3 dictionary results

tho⋅ri⋅a

  [thawr-ee-uh, thohr-]
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–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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tho·ri·a   (thôr'ē-ə, thōr'-)   
n.  See thorium dioxide.

[From thorium.]
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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