proofing

[ proo-fing ]
/ ˈpru fɪŋ /

noun

the act or process of making a thing resistant, as in waterproof fabrics or fireproof material.
any chemical used in the manufacture of a substance to make it proof against water, fire, etc.

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Origin of proofing

First recorded in 1900–05; proof + -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for proofing