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 gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
Place each container into leakproof, sealed transport device.
We have applied the process of uranium alloy casting directly into a leakproof
  ring jacket mould.
Double-walled piping or a leakproof liner in the piping trench can be used.
Freeze water in a rigid, leakproof plastic freezer container.
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