/ Dictionary / Index L leakproof: Meaning and Definition of Find definitions for: leak•proof Pronunciation: (lēk'prf"), [key] — adj. designed to prevent leaking: a leakproof bottle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: leakproof (Thesaurus) Leakey leaky Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language