/ Dictionary / Index P pipe organ: Meaning and Definition of Find definitions for: pipe' or"gan Pronunciation: [key] organ (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pipe of peace piper Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language