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FIRKIN
1. A varyingmeasure of ability, generally being the fourth part of a body; specifically, a measureequal to nine imperial gallons.
2. A littlewoodenvessel or cask of indeterminate size, used for butter, lard, etc.
Origin: From AS. Feower four (or an allied word, perh. Dutch or Danish) + -kin. See Four.
Source: Websters Vocabulary