Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “-proof”

-proof

suffix     /-pruːf/
protecting against, or not damaged by, a particular thing: a bullet-proof vest a waterproof/wind-proof jacket frost-proof pots for the gardenDefending and protectingBacking, supporting and defendingPreserving and saving
(Definition of -proof suffix from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of -proof

Browse related topics

You are looking at an entry to do with Defending and protecting, but you might be interested in these topics from the Protecting and saving topic area:

Definitions of “-proof” in other dictionaries

Word of the Day

beneficiary

a person or group who receives money, advantages, etc. as a result of something else

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More