/ Dictionary / Index G gill fungus: Meaning and Definition of Find definitions for: gill' fun"gus Pronunciation: (gil), [key] an agaricaceous fungus; mushroom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gill filament Gillian Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language