/ Dictionary / Index B bignoniaceous: Meaning and Definition of Find definitions for: big•no•ni•a•ceous Pronunciation: (big-nō"nē-ā'shus), [key] — adj. belonging to the plant family Bignoniaceae. Cf. bignonia (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bignoniaceous (Thesaurus) bignonia big one Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language