Breadcrumb Home > Dictionary > Index W water gap: Meaning and Definition of Find definitions for: wa'ter gap" Pronunciation: [key] a transverse gap in a mountain ridge, cut by and giving passage to a stream or river. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. waterfront water gas ✖ Related Content Daily Word Quiz: acronym Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language