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Underproof, un-dėr-prōōf′, adj. lower or weaker than proof, of alcohol.

But in some ways he was a kind of Thackeray several degrees underproof—a small-beer Thackeray that was a very excellent creature.

Thus, spirit of wine at 56 per cent. overproof, signifies that 100 gallons of it are equal to 156 gallons of proof spirit; while a spirit at 20 per cent. underproof, signifies that 100 gallons are equal to 80 gallons at proof.

The Excise rule is as follows:— To reduce from any given strength to any required strength, add the overproof per centage to 100, or subtract the underproof per centage from 100.

Multiply the result by the quantity of spirit, and divide the product by the number obtained by adding the required per centage overproof, or subtracting the required per centage underproof, to or from 100, as the case may be.