/ Dictionary / Index R riverweed: Meaning and Definition of Find definitions for: riv•er•weed Pronunciation: (riv'ur-wēd"), [key] — n. any of several chiefly tropical submerged aquatic plants of the genus Podostemum and related genera, growing in rapidly moving streams. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. riverward river wheat. 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