/ Dictionary / Index H horn poppy: Meaning and Definition of Find definitions for: horn' pop"py Pronunciation: [key] a European plant, Glaucium flavum, of the poppy family, having yellow flowers, naturalized along sandy shores in eastern North America. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hornpipe hornpout Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language