highproof
[hahyproof]

adjective
containing a high percentage of alcohol: highproof spirits.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for highproof
Historical Examples of highproof
It turned out that my water was highproof gin; yet this draught had no more effect on me than if it had been so much cold water.
Ned MyersJames Fenimore Cooper
Nitric acid will detect if there is cobalt in the lead, by adding to the acid half the quantity of highproof alcohol.
Reminiscences of GlassmakingDeming Jarves
To prevent fermentation, stir in a teacupful of highproof California brandy.
Clayton's Quaker CookBookH. J. Clayton