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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.

His first mantles were unsatisfactory, but they were improved in 1886 by the use of thoria, an oxide of thorium, in conjunction with other rare-earth oxides.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

It has been found that a mantle in which thoria is used alone is a poor light-source, but that when a small amount of ceria is added the mantle glows brilliantly.

From Artificial Light Its Influence upon Civilization by Luckiesh, Matthew

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 Luckiesh, Matthew

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 Luckiesh, Matthew

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 Slosson, Edwin E.

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