/ Dictionary / Index G gap junction: Meaning and Definition of Find definitions for: gap' junc"tion Pronunciation: [key] — Cell Biol. Cell Biol. a linkage of two adjacent cells consisting of a system of channels extending across a gap from one cell to the other, allowing the passage of ions and small molecules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gapeworm gaposis Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language