/ Dictionary / Index R rhizotomy: Meaning and Definition of Find definitions for: rhi•zot•o•my Pronunciation: (rī-zot'u-mē), [key] — pl. -mies. the surgical section or cutting of the spinal nerve roots, usually posterior or sensory roots, to eliminate pain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rhizotomy (Thesaurus) rhizopod Rh negative 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