/ Dictionary / Index R ruderal: Meaning and Definition of Find definitions for: ru•der•al Pronunciation: (r'dur-ul), [key] — Bot. Bot. —adj. (of a plant) growing in waste places, along roadsides or in rubbish. —n. a ruderal plant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rude Rüdesheimer Related Content Daily Word Quiz: menagerie Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language