/ Dictionary / Index S superior planet: Meaning and Definition of Find definitions for: supe'rior plan'et Pronunciation: [key] — Astron. Astron. any of the six planets whose orbits are outside the orbit of the earth: Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. superior ovary superior vena cava Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language