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)

• cheeks
• tail
• bum
• seat
• rump

Examples of bun in a Sentence

Noun (1)

an exercise to firm your buns

Recent Examples on the Web

Noun

This special deal included the classic burger—two beef patties, lettuce, tomato, pickles, diced onions, and mustard on a toasted bun—with optional customizations and add-ons for an additional charge. —James Bickerton, MSNBC Newsweek, 8 Aug. 2025

The Wet Hair Look Trend Slicked-back buns (or sloppy ponytails) aren’t the only way to keep your hair out of your face on a hot summer day. —Footwear News, 8 Aug. 2025

Old School Burger made with fresh brisket and chuck with bacon, cheddar, pickles and fancy sauce on a sesame brioche bun. —Endia Fontanez, AZCentral.com, 6 Aug. 2025

The classic hamburger features a large beef patty topped with lettuce, tomato, pickles, onions and mustard all served on a toasted bun, according to its website. —Tanasia Kenney, Fort Worth Star-Telegram, 6 Aug. 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