Definitions for outer planet
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Random House Webster's College Dictionary
out′er plan′et(n.)
any of the five planets with orbits outside the orbit of Mars: Jupiter, Saturn, Uranus, Neptune, and Pluto.
Category: Astronomy
Origin of outer planet:
1940–45
Wiktionary
outer planet(Noun)
Any planet of the Solar System whose orbit is located beyond the asteroid belt, i.e., any of Jupiter, Saturn, Uranus, or Neptune.
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"outer planet." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/outer planet>.