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thoria

American  
[thawr-ee-uh, thohr-] / ˈθɔr i ə, ˈθoʊr- /

noun

Chemistry.
  1. a white, heavy, water-insoluble powder, ThO 2 , used chiefly in incandescent mantles, as the Welsbach gas mantle.


thoria British  
/ ˈθɔːrɪə /

noun

  1. another name for thorium dioxide

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of thoria

First recorded in 1835–45; thori(um) + -a 4

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The specific gravity of pure thoria is 10.2207 to 10.2198.

From Scientific American Supplement, No. 365, December 30, 1882 by Various

The best results are obtained from a mixture of 99 parts thoria and 1 part ceria.

From Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries by Edwin E. Slosson

Later lamps consisted of "glowers" about one inch long made from a mixture of zirconia and yttria, and finally a mixture of ceria, thoria, and zirconia was used.

From Artificial Light Its Influence upon Civilization by Matthew Luckiesh

By experiment it was determined that the best proportions for the rare-earth content are one part of ceria and ninety-nine parts of thoria.

From Artificial Light Its Influence upon Civilization by Matthew Luckiesh

Other authorities hold that mantles for acetylene, should contain other rare earths besides the thoria and ceria of which the coal-gas mantles almost wholly consist.

From Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power by F. H. (Frank Henley) Leeds

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