/ Dictionary / Index J Jovian planet: Meaning and Definition of Find definitions for: Jo'vian plan'et Pronunciation: [key] — Astron. Astron. any of the four large outer planets: Jupiter, Saturn, Uranus, and Neptune. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Jovian jow Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language