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Definition of Winchester quart
1. Noun. (British) a unit of volume equal to half a Winchester gallon[ Weights and Measures of the City of Winchester] (retrieved 25 September 2007), equal to two quarts, or 2.273 litres. ¹
2. Noun. (British) a bottle of that size used in laboratories, commonly holding 2.5 litres. ¹
¹ Source: wiktionary.com