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

Hot jalapeño pepper jelly and spicy brown mustard kick these peaches up a notch, pairing perfectly with creaminess of the baked Brie. —Jenna Sims, Southern Living, 1 May 2026

Guests, including Chloe Malle, Amanda Seyfried, Huma Abedin, Aerin Lauder, and Steven Kolb, took their seats at tables dressed with Tory Burch’s Jardin d’Été poppy and mustard flower linens and listened to the class of 2026’s stories of resilience, entrepreneurship, and motherhood. —Jenna Adrian-Diaz, Vogue, 30 Apr. 2026

Mamlets are cooked in pungent mustard oil and amped up with onions and chiles. —Madhushree Basu Roy, Saveur, 30 Apr. 2026

The layout is straightforward but generous, with three bedrooms (two en suite) branching off a central living area that stays oriented toward the San Jacintos, and a largely white backdrop is warmed up with hints of coral, mustard, and other sunbaked tones. —Kristine Hansen, Architectural Digest, 30 Apr. 2026

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 greens
• 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 Brassicaceae synonym 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