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roux

[roo] /ru/
noun
1.
a cooked mixture of butter or other fat and flour used to thicken sauces, soups, etc.
Origin
1805-1815
1805-15; < French (beurre) roux brown (butter) < Latin russus red-brown, red-haired, akin to ruber red
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for roux

roux

/ruː/
noun (pl) roux
1.
a mixture of equal amounts of fat and flour, heated, blended, and used as a basis for sauces
Word Origin
C19: from French: brownish, from Latin russusrusset
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for roux
n.

sauce made from browned butter or fat, 1813, from French (beurre) roux "browned (butter)," from roux "red, reddish-brown," from Latin russus (see russet).

Online Etymology Dictionary, © 2010 Douglas Harper
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roux in Medicine

Roux (rōō), Pierre Paul Émile. 1853-1933.

French bacteriologist. His work with the diphtheria bacillus led to the development of antitoxins to neutralize pathogenic toxins.

Roux , Wilhelm. 1850-1924.

German anatomist who is noted for his research on embryonic development.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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roux in Science
Roux
  (r)   
French bacteriologist who assisted Louis Pasteur on most of his major discoveries. Later, working with Alexandre Yersin, he showed that the symptoms of diphtheria are caused by a lethal toxin produced by the diphtheria bacillus. Roux carried out early work on the rabies vaccine and directed the first tests of the diphtheria antitoxin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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