WordReference Random House Unabridged Dictionary of American English © 2026
out′er plan′et, [Astron.]
  1. Astronomyany of the five planets with orbits outside the orbit of Mars: Jupiter, Saturn, Uranus, Neptune, and Pluto. Cf. inner planet. 
  • 1940–45

'outer planet' also found in these entries (note: many are not synonyms or translations):
inner planet - opposition - superior planet

Forum discussions with the word(s) "outer planet" in the title:


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