a round vessel or cask, of greater length than breadth, and bulging in the middle, made of staves bound with hoops, and having flat ends or heads.-the quantity which constitutes a full barrel. this varies for different articles and also in different places for the same article, being regulated by custom or by law. a barrel of wine is 31/ gallons; a barrel of flour is 196 pounds.-a solid drum, or a hollow cylinder or case; as, the barrel of a windlass; the barrel of a watch, within which the spring is coiled.-a metallic tube, as of a gun, from which a projectile is discharged.-a jar.-the hollow basal part of a feather.-to put or to pack in a barrel or barrels.