| 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. |
| proof spirit n. An alcohol-water mixture or a beverage containing a standard amount of alcohol, the U.S. standard being 100 proof, or 50 percent, of ethyl alcohol by volume at 60°F (approximately 15.6°C). |