United States liquid unit - a liquid unit officially adopted in the United States Customary System

British capacity unit, Imperial capacity unit - a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet

gal, gallon - United States liquid unit equal to 4 quarts or 3.785 liters

congius, Imperial gallon, gallon - a British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters

hogshead - a British unit of capacity for alcoholic beverages