Longman Dictionary of Contemporary English homepage

-proof

 suffix
     
-proof
1 [in adjectives] used to describe something which a particular thing cannot harm or pass through, or which protects people against that thing:
a bulletproof car
a waterproof jacket
an ovenproof dish (=that cannot be harmed by heat)
2 [in adjectives] used to describe something which cannot easily be affected or damaged by someone or something:
a childproof container
vandal-proof
3 [in verbs] to treat or make something so that a particular thing cannot harm it or pass through it, or so that it gives protection against it:
soundproof a room (=so that sound cannot get into or out of it)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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