Firkin

n.	1.	A varying measure of capacity, usually being the fourth part of a barrel; specifically, a measure equal to nine imperial gallons.
	2.	A small wooden vessel or cask of indeterminate size, - used for butter, lard, etc.

Noun	1.	firkin - a British unit of capacity equal to 9 imperial gallons
	2.	firkin - a small wooden keg

British capacity unit, congius, gallon, Imperial capacity unit, Imperial gallon, kilderkin