leak·proof

[leek-proof]
adjective
designed to prevent leaking: a leakproof bottle.

Origin:
1925–30; leak + -proof

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
leakproof

adjective
not subject to leaks 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Leakproof is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
Example sentences
Specimens should be shipped in leakproof double mailing containers according to
  regulations for diagnostic specimens.
All materials should be transported in non-breakable, leakproof containers,
  which can be decontaminated if necessary.
Each primary receptacle containing a liquid must be leakproof.
Absolutely leakproof, evaporation-proof, fully guaranteed.
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