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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.
1940-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for outer-planet

outer planet

any of the planets Jupiter, Saturn, Uranus, Neptune, and (formerly) Pluto, whose orbit lies outside the asteroid belt
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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outer-planet in Science
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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