/ Dictionary / Index G gill cleft: Meaning and Definition of Find definitions for: gill' cleft" Pronunciation: (gil). [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gill box Gillespie Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language