/ Dictionary / Index E evening primrose: Meaning and Definition of Find definitions for: eve'ning prim'rose Pronunciation: [key] a plant, Oenothera biennis, having yellow flowers that open at nightfall. any of various plants of the same or related genera. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. evening prayer evening primrose family Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language