Breadcrumb Home > 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: porcine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language