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proof spirit

an alcoholic liquor, or mixture of alcohol and water, containing a standard amount of alcohol. In the U.S. proof spirit has a specific gravity of .93353 (containing one half of its volume of alcohol of a specific gravity of .7939 at 60° F). In Britain proof spirit has a specific gravity of .91984.
Origin of proof spirit
1735-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for proof-spirit
Historical Examples
  • Afterwards it may be bathed with a lotion, (made of nitric acid one drachm, to proof-spirit one ounce,) and then returned.

    The Dog Dinks, Mayhew, and Hutchinson
British Dictionary definitions for proof-spirit

proof spirit

(in Britain and Canada) a mixture of alcohol and water or an alcoholic beverage that contains 49.28 per cent of alcohol by weight, 57.1 per cent by volume at 51°F: up until 1980 used as a standard of alcoholic liquids
(in the US) a similar standard mixture containing 50 per cent of alcohol by volume at 60°F
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
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