/ Dictionary / Index R Riemann sphere: Meaning and Definition of Find definitions for: Rie'mann sphere" Pronunciation: [key] — Math. Math. a sphere used for a stereographic projection. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Riemann integral Riemann-Stieltjes integral Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language