Breadcrumb Home > Dictionary > Index O observation car: Meaning and Definition of Find definitions for: observa'tion car" Pronunciation: [key] a railroad passenger car having a lounge or platform from which the scenery can be viewed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. observational observation post ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language