Outer-planet

outer planet

noun Astronomy.
any of the four planets with orbits outside the orbit of Mars, namely, the planets Jupiter, Saturn, Uranus, and Neptune.
Compare inner planet.


Origin:
1940–45

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Collins
World English Dictionary
outer planet
 
n
any of the planets Jupiter, Saturn, Uranus, Neptune, and (formerly) Pluto, whose orbit lies outside the asteroid belt

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
outer planet  
Any of the five planets Jupiter, Saturn, Uranus, Neptune, and Pluto, whose orbits lie outside that of Mars. With the exception of Pluto, the outer planets are large gas giants. Compare inner planet. See also superior planet.
The American Heritage® Science Dictionary
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