Definition of proof spirit
: an alcoholic liquor or mixture of ethanol and water that contains 50 percent ethanol by volume at 60°F (16°C)
First Known Use of proof spirit
Medical Definition of proof spirit
1: an alcoholic liquor or mixture of alcohol and water containing 50 percent ethanol by volume at 60° F (15.6°C)
2British : liquor that weighs 12⁄13 of an equal measure of distilled water or contains 57.10 percent by volume of alcohol
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Medical Dictionary: Definition of "proof spirit"
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