/ Dictionary / Index F flying boxcar: Meaning and Definition of Find definitions for: fly'ing box'car Pronunciation: [key] — Informal. Informal. a large airplane designed to carry cargo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. flying bond flying bridge Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language