-proof

-proof

a combining form meaning “resistant, impervious to” that specified by the initial element: burglarproof; childproof; waterproof.
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-proof
 
adj, —combining form
secure against (damage by); (make) impervious to: waterproof; mothproof; childproof
 
[from proof (adj)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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