[n] a cylindrical container that holds liquids
[n] a tube through which a bullet travels when a gun is fired
[n] any of various units of capacity; "a barrel of beer is 31 gallons and a barrel of oil is 42 gallons"
[n] the quantity that a barrel (of any size) will hold
[n] a bulging cylindrical shape; hollow with flat ends
[v] put in barrels