7 letters · 15 points in Scrabble
noun either of the two large fleshy masses of muscular tissue that form the human rump
originInherited from 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 (diminutive suffix).
Etymology from Wiktionary, CC BY-SA 3.0