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-proof
a combining form meaning “resistant, impervious to” that specified by the initial element:
burglarproof; childproof; waterproof.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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-proof
Collins
World English Dictionary
-proof
—
adj
, —
combining form
secure against (damage by); (make) impervious to:
waterproof
;
mothproof
;
childproof
[from
proof
(adj)]
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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