Other forms: buttocks
A buttock is one of the two fleshy parts you sit on. The left buttock, an injection in the buttock, clench the buttocks.
It is the clinical and the polite word, which is why doctors and anatomy books use it where speech has a dozen informal alternatives. The muscle beneath is the gluteus maximus, the largest in the body, and it is what lets humans stand upright.
1nounbuttockOne of the two fleshy parts you sit on.
“He slipped on the ice and landed hard on his left buttock.”
buttock is a body part.
Middle English buttok, probably from an Old English word meaning an end or short piece of land.
Old English
buttuc — end; end piece”; also, “short piece of land
Middle English
buttok
English, today
buttock
Middle English buttok, probably from Old English buttuc (“end; end piece”; also, “short piece of land”). Attested with its current anatomical meaning since 1300. A diminutive form of what is presumably the Old English precursor of butt + -ock.
Etymology from Wiktionary, CC BY-SA