/ Dictionary / Index D Dumbbell nebula: Meaning and Definition of Find definitions for: Dumb'bell neb"ula Pronunciation: [key] — Astron. Astron. the planetary nebula in the constellation Vulpecula, which in photographs appears to have the shape of a dumbbell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dumbbell dumb bid Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language