In Apothecary Measures, the Latin Congius (abbreviation c.) is used for the Queen Anne gallon of 231 cubic inches, also known as the US gallon.

How many pints are in a Congius?

six pints ‘But just when I thought it was going to get good and circular it turns out that a congius is roughly equal to six pints, and so a sextarius is one pint. ‘ ‘In the nineteenth century, the congius was used in British medicine and pharmacology as a name for the British Imperial gallon. ‘