a former English gallon of 160 fluid ounces: equal to the present U.S. standard gallon of 128 fluid ounces.
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Origin of wine gallon
First recorded in 1650–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for wine gallon
British a former unit of capacity equal to 231 cubic inches
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012