-proof Hear it!

-proof definition

-proof (pro̵̅o̅f)

  1. impervious to waterproof
  2. protected from or against foolproof, rustproof
  3. resistant to, unaffected by fireproof

Etymology: < proof

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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