-proof
a combining form meaning “resistant, impervious to” that specified by the initial element: burglarproof; childproof; waterproof.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for -proof
-proof
adjective, combining form
secure against (damage by); (make) impervious towaterproof; mothproof; childproof
Word Origin for -proof
from proof (adj)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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