Buttocks
/ˈbʌt.əks/noun
The two rounded fleshy parts of the body that sit on the pelvis.
Did you know?English has long used blunt body terms for the backside, and “buttocks” is one of the few everyday words whose history stays stubbornly practical rather than mystical.
Etymological Timeline
Old English
OE
buttuc
“A short projection, end, or rounded stump; later also used for the rump in dialectal and related forms.”
Middle English
ME
buttok
“A rounded end or stump; by extension, the backside or rump.”
Late Middle English
ME
buttockes
“The buttocks; the two rounded fleshy parts of the body.”
Modern English
English
buttocks
“The two fleshy parts of the body on which a person sits.”