mustard

noun

mus·​tard ˈmə-stərd 

1

a

: a pungent yellow condiment consisting of the pulverized seeds of various mustard plants (such as Sinapis alba, Brassica juncea, and B. nigra) either dry or made into a paste or sauce (as by mixing with water or vinegar) and sometimes adulterated with other substances (such as turmeric) or mixed with spices

b

: the seed of a mustard plant used as a spice and in medicine as a stimulant and diuretic, an emetic, or a counterirritant

c

slang : zest

2

: any of several herbs (genera Brassica and Sinapis of the family Brassicaceae synonym Cruciferae, the mustard family) with lobed leaves, yellow flowers, and linear beaked pods

3

: a dark to moderate yellow

mustardy

ˈmə-stər-dē 

adjective

Illustration of mustard

• mustard 2

Examples of mustard in a Sentence

Would you like some mustard on your hot dog?

Recent Examples on the Web

Each burger is hand-packed with crisp lettuce, tomato, pickles and just a swipe of mustard — nothing unnecessary, nothing pretentious. —Tiffani Jackson, Fort Worth Star-Telegram, 24 Oct. 2025

The space has been decorated with powder pink rugs; stonewashed walls and mustard couches. —Hikmat Mohammed, Footwear News, 23 Oct. 2025

In a large bowl, whisk together lemon juice, olive oil, mustard, mayonnaise, honey, salt, and pepper. —Elizabeth Nelson, Southern Living, 23 Oct. 2025

They’re topped with just the right amount of melty American cheese and a bright dijon mustard sauce on a sturdy brioche bun that holds up to the juiciness. —Jared Kaufman, Twin Cities, 22 Oct. 2025

Word History

Etymology

Middle English, from Anglo-French mustarde, from must must, from Latin mustum

First Known Use

13th century, in the meaning defined at sense 1a

Phrases Containing mustard

• (as) keen as mustard
• cut the mustard
• Dijon mustard
• mustard gas
• mustard plaster
• nitrogen mustard
• white mustard
• wild mustard

Rhymes for mustard

• blustered
• bustard
• clustered
• custard
• flustered
• mustered

Kids Definition

mustard

noun

mus·​tard ˈməs-tərd 

1

: any of several yellow-flowered herbs related to the turnips and cabbages

2

a

: a yellow sharp-tasting condiment consisting of the crushed seeds of various mustard plants either dry or made into a paste or sauce

b

: the seeds of a mustard plant

Medical Definition

mustard

noun

mus·​tard ˈməs-tərd 

1

: a pungent yellow condiment consisting of the pulverized seeds of the black mustard or sometimes the white mustard either dry or made into a paste and serving as a stimulant and diuretic or in large doses as an emetic and as a counterirritant when applied to the skin as a poultice

2

: any of several herbs (genus Brassica of the family Cruciferae, the mustard family) with lobed leaves, yellow flowers, and linear beaked pods see black mustard sense 1, white mustard

3

a

: mustard gas

b

: nitrogen mustard