/ Dictionary / Index R rhamnaceous: Meaning and Definition of Find definitions for: rham•na•ceous Pronunciation: (ram-nā'shus), [key] — adj. belonging to the Rhamnaceae, the buckthorn family of plants. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -rhagia rhamnose Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language