/ Dictionary / Index F fungus bug: Meaning and Definition of Find definitions for: fun'gus bug". Pronunciation: [key] See Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. fungus fungus gnat Related Content Daily Word Quiz: anecdote Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language