Keg n. : A small cask or barrel.

Example:


Taxonomy
keg, Barrel, liters, imperial gallons, valve, steel, Keg beer, fl oz, beer kegs, pony keg, ø, sizes, vessel, imperial pints, gallon kegs, cask beer, liquid, pressure.

Defination from the web:
keg as well. Such liquids are generally kept under pressure. ... Since keg sizes are not standardized, the keg cannot be used as a standard unit of measure for liquid volumes. ...