Longman Dictionary of Contemporary English homepage

waterproof

1 adjective
     
wa‧ter‧proof1
not allowing water to enter:
a waterproof jacket
waterproof adhesive
Rub the wax in to make the shoe waterproof.
—waterproof verb [transitive]
Plastic sheeting was used to waterproof the shed.
 —waterproofed adjective [only before noun]
a waterproofed sack.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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