Firkin

A Firkin is a unit of volume equal to 9 imperial gallons. It is traditionally used in beer measurement to represent one quarter of a barrel. The name is dervived from the Middle Dutch word vierdekijn, which means fourth. Firkin can also refer to the container that holds 9 imperial gallons.

Reference: Web WordNet (http://www.cogsci.princeton.edu/cgi-bin/webwn?stage=1&word=firkin)

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