/ Dictionary / Index G gill bar: Meaning and Definition of Find definitions for: gill' bar" Pronunciation: (gil). [key] See(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gill arch gill book Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language