- not penetrable by water
Compare water-repellent, water-resistant
- chiefly Brit a waterproof garment, esp a raincoat
- to make (a fabric, item of clothing, etc) waterproof
WordReference Random House Learner's Dictionary of American English © 2026
wa•ter•proof /ˈwɔtɚˌpruf, ˈwɑtɚ/USA pronunciation
adj.
v. [~ + object]
WordReference Random House Unabridged Dictionary of American English © 2026- that does not allow water to penetrate:a waterproof raincoat.
v. [~ + object]
- to make waterproof.
wa•ter•proof
(wô′tər pro̅o̅f′, wot′ər-),USA pronunciation adj.
n.
v.t.
wa′ter•proof′er, n.
wa′ter•proof′ness, n.
- impervious to water.
- rendered impervious to water by some special process, as coating or treating with rubber:a waterproof hat.
n.
- British Terms[Chiefly Brit.]a raincoat or other outer coat impervious to water.
- any of several coated or rubberized fabrics that are impervious to water.
v.t.
- to make waterproof.
- water + -proof 1730–40
wa′ter•proof′ness, n.
Collins Concise English Dictionary © HarperCollins Publishers::
waterproof /ˈwɔːtəˌpruːf/ adj
'waterproof' also found in these entries (note: many are not synonyms or translations):
anorak
- Barbour jacket
- caulk
- cerecloth
- curry
- diving suit
- donkey jacket
- dubbin
- feather
- fuse
- gaiter
- galoshes
- greasy wool
- groundsheet
- ice bag
- loden
- mackintosh
- neoprene
- oilcloth
- oilskin
- paraffin wax
- proof
- -proof
- raincoat
- re-proof
- rubber
- shell suit
- sou'wester
- tarpaulin
- tent
- trench coat
- waders
- waterbed
- wax paper
- arctic
- boot
- built-up roof
- Burberry
- camlet
- coracle
- decking
- dope
- Fabrikoid
- faltboat
- galosh
- glazement
- gossamer
- lanolin
- Nansen bottle
- oilpaper