[ roo ]
/ ru /


a cooked mixture of butter or other fat and flour used to thicken sauces, soups, etc.

Nearby words

  1. routing,
  2. routinism,
  3. routinist,
  4. routinization,
  5. routinize,
  6. rouyn,
  7. roué,
  8. rov,
  9. rovaniemi,
  10. rove

Origin of roux

1805–15; < French (beurre) roux brown (butter) < Latin russus red-brown, red-haired, akin to ruber red1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for roux

British Dictionary definitions for roux


/ (ruː) /

noun plural roux

a mixture of equal amounts of fat and flour, heated, blended, and used as a basis for sauces

Word Origin for roux

C19: from French: brownish, from Latin russus russet

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

Word Origin and History for roux



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

Medicine definitions for 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.


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.

Science definitions for roux


[ rōō ]
(Pierre Paul) Émile 1853-1933

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.