/ Dictionary / Index B blue flash: Meaning and Definition of Find definitions for: blue' flash'. Pronunciation: [key] — Meteorol. Meteorol. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blue flag blue flu Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language