/ Dictionary / Index C chromosphere: Meaning and Definition of Find definitions for: chro•mo•sphere Pronunciation: (krō'mu-sfēr"), [key] — n. Astron. a scarlet, gaseous envelope surrounding the sun outside the photosphere, from which enormous quantities of hydrogen and other gases are erupted. a gaseous envelope surrounding a star. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: chromosphere (Thesaurus) chromosome number chromous Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language