mustard
Americannoun
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a pungent powder or paste prepared from the seeds of certain mustard plants, used as a food seasoning or condiment, and medicinally in plasters, poultices, etc.
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Botany. any of various cruciferous plants of the mustard family, noted for their acrid and pungent qualities and widely cultivated for culinary and agricultural purposes: among the most commercially important mustards are black mustard, brown mustard, and white mustard.
idioms
noun
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any of several Eurasian plants of the genus Brassica, esp black mustard and white mustard, having yellow or white flowers and slender pods and cultivated for their pungent seeds: family Brassicaceae (crucifers) See also charlock
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a paste made from the powdered seeds of any of these plants and used as a condiment
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a brownish-yellow colour
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( as adjective )
a mustard carpet
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slang zest or enthusiasm
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slang to come up to expectations
Etymology
Origin of mustard
First recorded in 1250–1300; Middle English mostard(e), mustart, from Old French mostarde, moustarde, a relish originally made of mustard seed and must, equivalent to moust + -arde; see origin at must 2, -ard
Explanation
Mustard is the yellow sauce people commonly use to spice up their hotdogs. Whether it's ballpark mustard or fancy Grey Poupon, it's a condiment made from the ground seeds of the mustard plant. Mustard comes in several different forms, including the bright yellow kind in a packet at your favorite fast food restaurant and the brownish, slightly coarse mustard that comes in a fancy jar labeled "Dijon." All of these mustards are made from mustard seeds and spices, often mixed with lemon juice and salt. The plant that grows these seeds also produces edible leaves called "mustard greens."
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.
By peak summer, I harvest a karela for lunch daily, slice it into thin discs, smear mustard oil, turmeric, cumin with chili powder.
From Salon • May 9, 2026
Dubowski said he had experienced a "strange bit of self-doubt" earlier after he was asked what was mixed with vinegar, mustard and oil to make a basic mayonnaise.
From BBC • Apr. 26, 2026
He’s the brainchild behind my favorite dish, the Fuhgeddaboudit pizza, which is made with pastrami, pickles and mustard.
From Los Angeles Times • Apr. 23, 2026
The deal comes as McCormick, which sells French’s mustard, Old Bay seasoning and Frank’s RedHot sauces along with its spice range, was struggling as consumers’ spending and eating habits are in flux.
From MarketWatch • Mar. 31, 2026
Just last week we helped Mama plant collard and mustard green seeds and sweet potatoes to harvest later in the fall and into winter.
From "Root Magic" by Eden Royce
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.