/ Dictionary / Index R Red Spot: Meaning and Definition of Find definitions for: Red' Spot" Pronunciation: [key] — Astron. Astron. a large, usually reddish gaseous vortex on the surface of Jupiter, about 14,000 by 30,000 km, that drifts about slowly as the planet rotates and has been observed for several hundred years. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. red spider red-spotted purple Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language