/ Dictionary / Index R rhizome: Meaning and Definition of Find definitions for: rhi•zome Pronunciation: (rī'zōm), [key] — n. Bot. a rootlike subterranean stem, commonly horizontal in position, that usually produces roots below and sends up shoots progressively from the upper surface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rhizome (Thesaurus) rhizoid rhizomorph Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language