/ Dictionary / Index R Ring Nebula: Meaning and Definition of Find definitions for: Ring' Neb"ula Pronunciation: [key] — Astron. Astron. a planetary nebula in the constellation Lyra that has a ringlike appearance surrounding its central star. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ringmaster ringneck Related Content Daily Word Quiz: pertinent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language