1.Definition: a bulging cylindrical shape; hollow with flat ends

Related Noun(s):drum

Category: General

2.Definition: a cylindrical container that holds liquids

Related Noun(s):cask

Category: Objects

3.Definition: a tube through which a bullet travels when a gun is fired

Category: Objects

4.Definition: any of various units of capacity

"A barrel of beer is 31 gallons and a barrel of oil is 42 gallons"

Category: General

5.Definition: the quantity that a barrel (of any size) will hold

Related Noun(s):barrelful

Category: General