/ Dictionary / Index A acanthaceous: Meaning and Definition of Find definitions for: ac•an•tha•ceous Pronunciation: (ak"un-thā'shus), [key] — adj. having prickly growths. belonging to the plant family Acanthaceae. Cf. acanthus family. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. AC and U acanthite Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language