/ Dictionary / Index H hopper car: Meaning and Definition of Find definitions for: hop'per car" Pronunciation: [key] — Railroads. Railroads. a freight car, usually open at the top and containing one or more hoppers so that bulk cargo can be quickly discharged through its bottom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hopper barge hopper casement Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language