/ Dictionary / Index L lightning bug: Meaning and Definition of Find definitions for: light'ning bug" Pronunciation: [key] firefly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lightning arrester lightning chess Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language