bun

1 of 2

noun (1)

ˈbən 

1

: a sweet or plain small bread

especially : a round roll

2

: a knot of hair shaped like a bun

3

buns plural : buttocks

bun

2 of 2

noun (2)

: load sense 4

Synonyms

Noun (1)

• backside
• behind
• booty [slang]
• bootie
• bottom
• breech
• bum
• butt
• buttocks
• caboose
• can
• cheeks
• derriere
• derrière
• duff
• fanny
• fundament
• hams
• haunches
• heinie [slang]
• hunkers
• keister [slang]
• keester
• nates
• posterior
• rear
• rear end
• rump
• seat
• tail
• tail end
• tush [slang]

Examples of bun in a Sentence

Noun (1)

an exercise to firm your buns

Recent Examples on the Web

Noun

True to their TikTok reputation, every element—including the brioche buns—is made from scratch. —Elise Taylor, Vogue, 24 Apr. 2025

The deal on the burgers – each comes with American cheese, lettuce, tomatoes, red onions, pickles, Smash Sauce, and ketchup on a toasted bun – is good in stores, online and through the Smashburger app. —Mike Snider, USA Today, 19 Apr. 2025

From pickled fish in South Africa to hot cross buns in the U.K., here’s how five countries bring meaning to the table on this quietly enduring day. —Stephanie Gravalese, Forbes.com, 17 Apr. 2025

The chicken sandwich is served with coleslaw, pickles and a house sauce on a brioche bun. —Carlos Rico, San Diego Union-Tribune, 17 Apr. 2025

Word History

Etymology

Noun (1)

Middle English bunne

Noun (2)

perhaps from bun entry 1

First Known Use

Noun (1)

14th century, in the meaning defined at sense 1

Noun (2)

1898, in the meaning defined above

Phrases Containing bun

• have a bun in the oven
• sticky bun

Rhymes for bun

• done
• dun
• fun
• gun
• hun
• jun
• none
• nun
• one
• pun
• run
• shun

Kids Definition

bun

noun

ˈbən

1

: a sweet or plain small bread

especially : a round roll

2

: a knot of hair shaped like a bun

Medical Definition

BUN

noun

ˌbē-ˌyü-ˈen 

: the concentration of nitrogen in the form of urea in the blood