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• roux
  roux

  noun

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

  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.

roux

American  

[roo] / ru /

noun

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

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roux British  

/ ruː /

noun

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

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Roux Scientific  

/ ro̅o̅ /

1. 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.

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Etymology

Origin of roux

1805–15; < French ( beurre ) roux brown (butter) < Latin russus red-brown, red-haired, akin to ruber red ¹

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Explanation

A roux is the base of many sauces, made by combining and cooking flour with some kind of fat. If you're making a Cajun recipe, your roux might be a mixture of flour and bacon fat. Cheese sauces, gravies, and staples of French cuisine like Béchamel sauce all begin as a roux. For most roux, you start by heating butter, oil, or another fat in a pan, then add flour and cook it while stirring or whisking until it's completely incorporated and there's no lingering taste of raw flour. Other ingredients, like milk, cream, cheese, or water, are added slowly to the roux. In French, roux means both "browned butter" and "reddish-brown."

Example Sentences

See Examples For:

roux Roux

Andouille sausage and the marinated chicken are cooked in a separate pot before adding in the onions, peppers, celery, garlic and homemade roux.

From Salon ● Dec. 15, 2025

He relied on his light roux and the juices from the freshly shucked oysters to properly enrich the broth.

From Salon ● Nov. 7, 2024

Doesn’t matter if it’s caramel, some sort of roux or queso, I’m always hunched over a hot pot stirring my wrist off, testing and adding until it tastes perfect.

From Seattle Times ● May 14, 2024

Rather boringly brown in presentation, the gumbo gets velvety from a luxe roux, echoing smoke, faint heat and stages of flavor, with all the tastes and texture of the sausage incorporated through.

From Seattle Times ● Jul. 26, 2023

If the roux is for white sauce do not let the flour color.

From The Century Cook Book by Mary Ronald

Cordova also shared an independent report the company commissioned from consulting firm Roux Associates, which he said “found no evidence in the administrative record ... demonstrating that the site adversely affects public health.”

From Los Angeles Times ● Oct. 3, 2026

The BBC has asked La Roux for further comment.

From BBC ● Jun. 10, 2026

Le Roux and team highlight the potential for a swing back toward large caps because institutional investors tend to be “value-driven and slow-moving,” so overweighting the cheaper small cap index was unavoidable.

From MarketWatch ● May 5, 2026

The company’s chief operating officer, Pol Le Roux, said it had actually been 30 years.

From The Wall Street Journal ● Apr. 26, 2026

The owner lured Roux away with a shriveled pig’s ear, which is apparently a canine delicacy?

From "From Twinkle, with Love" by Sandhya Menon

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