/ Dictionary / Index N nymphaeaceous: Meaning and Definition of Find definitions for: nym•phae•a•ceous Pronunciation: (nim"fē-ā'shus), [key] — adj. belonging to the Nymphaeaceae, the water lily family of plants. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nympha nymphaeum Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language