/ Dictionary / Index W waterproof: Meaning and Definition of Find definitions for: wa•ter•proof Pronunciation: (wô'tur-prf", wot'ur-), [key] — adj. impervious to water. rendered impervious to water by some special process, as coating or treating with rubber: a waterproof hat. —n. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: waterproof (Thesaurus) water pox waterproofing Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language