Breadcrumb Home > Dictionary Cite Meaning of flat bug Find definitions for: flat' bug" Pronunciation: [key] any of numerous flattened bugs of the family Aradidae, inhabiting the underside of bark and feeding on fungi. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. flatbread flatcar Related Content Daily Word Quiz: parallax Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language