/ Dictionary / Index D Dien Bien Phu: Meaning and Definition of Find definitions for: Dien Bien Phu Pronunciation: (dyen'-byen"-f'), [key] a town in NW Vietnam: site of defeat of French forces by Vietminh 1954, bringing to an end the French rule of Indochina. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Diels-Alder reaction diencephalon Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language