buttock

noun

but·​tock ˈbə-tək 

also -(ˌ)täk

1

: the back of a hip that forms one of the fleshy parts on which a person sits

2

buttocks plural

a

: the seat of the body

b

: rump sense 1a

Synonyms of buttock

• cheeks
• bum
• seat
• tail
• rump

Examples of buttock in a Sentence

she slipped in the mud puddle and hit the ground square on her buttocks

Recent Examples on the Web

These users were also more likely to develop skin cancers on parts of their body that had rarely been exposed to sun, such as the lower back and buttocks. —New Atlas, 15 Dec. 2025

The study also noted that tanning bed users were more likely to develop melanoma in places that aren’t typically impacted by everyday sun exposure, like the buttocks and lower back, because most tanning bed users tan naked or in their underwear. —Kara Nesvig, Allure, 12 Dec. 2025

And, Gerami notes, those who used tanning beds had mutations in areas of the body typically protected from the sun, such as the lower back or buttocks. —Emily Kay Votruba, EverydayHealth.com, 12 Dec. 2025

Investigators also revealed that within 30 minutes of the killings, Dambrosio allegedly entered a local coffee shop and slapped a female employee on the buttocks before driving to the deli to kill his parents. —Julia Bonavita, FOXNews.com, 8 Dec. 2025

Word History

Etymology

Middle English buttok — more at butt entry 1

First Known Use

13th century, in the meaning defined at sense 1

Kids Definition

buttock

noun

but·​tock ˈbət-ək 

1

: the back of the hip which forms one of the fleshy parts on which a person sits

2

plural

a

: the seat of the body

b

: rump sense 1a

Medical Definition

buttock

noun

but·​tock ˈbət-ək 

1

: the back of a hip that forms one of the fleshy parts on which a person sits

2

buttocks plural : the seat of the body

also : the corresponding part of a quadruped : rump