Firkin (unit)
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A firkin is a unit of volume or mass used in several situations. Its etymology is likely to be from the Middle English ferdekyn, probably from the Middle Dutch diminutive of vierde 'fourth' (a firkin originally contained a quarter of a barrel). Firkin also describes a small wooden cask or tub for butter, lard, liquids, or fish.[1][2]
A firkin was an American unit of dry measure.
1 firkin = 9 US gallons = 34 litres[3]
American naturalist John Burroughs (1837–1921) in his boyhood memoir described a firkin as weighing 100 pounds when loaded with salted butter.[4]