wa•ter•proofPronunciation: (wô'tur-prOOf", wot'ur-), [key]
impervious to water.
rendered impervious to water by some special process, as coating or treating with rubber: a waterproof hat.
1. Chiefly Brit.
a raincoat or other outer coat impervious to water.
any of several coated or rubberized fabrics that are impervious to water.
to make waterproof.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.