barrel

(noun) a tube through which a bullet travels when a gun is fired. Synonyms: gun barrel.

(noun) a cylindrical container that holds liquids. Synonyms: cask.

(noun) a bulging cylindrical shape; hollow with flat ends. Synonyms: drum.

(noun) the quantity that a barrel (of any size) will hold. Synonyms: barrelful.

(noun) any of various units of capacity. Synonyms: bbl. Example: "A barrel of beer is 31 gallons and a barrel of oil is 42 gallons."

(verb) put in barrels.