This oughta clear it up:

History of the "pint"

The pint is defined as one eighth of a gallon. Other versions of the gallon were defined for different commodities, and there were equally many versions of the pint.

America adopted the British wine gallon (defined in 1707 as 231 cubic inches) as its basic liquid measure, from which the U.S. wet pint is derived, and the British corn gallon (⅛ of a standard “Winchester” bushel of corn, or 268.8 cubic inches) as its dry measure, from which the US dry pint is derived.

In 1824 the British parliament replaced all its variant gallons with a new imperial gallon based on ten pounds of distilled water at 62 °F (277.42 cubic inches), from which the UK pint is derived.

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