designed to prevent leaking: a leakproof bottle.

1925–30; leak + -proof

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Lastly, it needs to be covered with a layer of non-porous, non-cracked rock to
  provide a leakproof cap.
Place any damaged batteries in leakproof containers.
Leakproof irrigation technology meant that less water returned to the system.
Absolutely leakproof, evaporation-proof, fully guaranteed.
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