Pronunciation: (gal'un), [key]
a common unit of capacity in English-speaking countries, equal to four quarts, the U.S. standard gallon being equal to 231 cubic inches (3.7853 liters), and the British imperial gallon to 277.42 cubic inches (4.546 liters). Abbr.: gal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.