waterproof

/ˈwɑɾərpruf/

/ˈwɔtepruf/

Other forms: waterproofs; waterproofing; waterproofed

Water can't penetrate something that's waterproof. Umbrellas and rain boots don't work very well if they're not waterproof.

Waterproof jackets will keep you dry even if it starts to rain, and waterproof mascara won't run in black streaks down your face even if you're weeping at a sad movie. You can use this word as a verb, too: "We should waterproof the tent before we go camping this weekend — it's supposed to pour!" If you're British, you might also use waterproof as a noun, to mean a waterproof rain coat.

Definitions of waterproof

1. adjective

   not permitting the passage of water
   synonyms: rainproof, waterproofed

   tight

   of such close construction as to be impermeable
2. verb

   make watertight
   “Waterproof the coat”

   type of:

   seal, seal off

   make tight; secure against leakage
3. noun

   any fabric impervious to water
   type of:

   cloth, fabric, material, textile

   artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
4. noun

   a water-resistant coat
   synonyms: raincoat

   types:

   Burberry

   a lightweight belted raincoat typically made of tan gabardine with a distinctive tartan lining; named for the original manufacturer

   mac, macintosh, mack, mackintosh

   a waterproof raincoat made of rubberized fabric

   trench coat

   a military style raincoat; belted with deep pockets

   oilskin, slicker

   a macintosh made from cotton fabric treated with oil and pigment to make it waterproof

   type of:

   coat

   an outer garment that has sleeves and covers the body from shoulder down; worn outdoors