/ Dictionary / Index R Rh negative: Meaning and Definition of Find definitions for: Rh neg•a•tive Pronunciation: (är'āch' neg'u-tiv). [key] See under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rhizotomy rho Related Content Daily Word Quiz: pudgy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language