/ Dictionary / Index N nyctaginaceous: Meaning and Definition of Find definitions for: nyc•ta•gi•na•ceous Pronunciation: (nik"tu-ju-nā'shus), [key] — adj. belonging to the Nyctaginaceae, the four-o'clock family of plants. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nyct- nyctalgia Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language