[ proo-fing ]

  1. the act or process of making a thing resistant, as in waterproof fabrics or fireproof material.

  2. any chemical used in the manufacture of a substance to make it proof against water, fire, etc.

Origin of proofing

First recorded in 1900–05; proof + -ing1

Words Nearby proofing Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use proofing in a sentence