Meanings
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1
noun
either of the two rounded fleshy parts at the back of the pelvis, formed chiefly by the gluteal muscles
The injection was given in the upper outer part of the left buttock.
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2
noun
nautical: the rounded afterpart of a ship's hull beneath the stern
The surveyor inspected the curve of the ship's buttock for damage below the waterline.
Thesaurus
Etymology
From Middle English buttok, probably a diminutive formed from the ancestor of butt, 'end,' with the suffix -ock. The anatomical sense has been recorded since the Middle Ages; shipbuilders later applied the rounded-body comparison to a vessel's stern.