Definitions for outer planet
This page provides all possible meanings and translations of the word outer planet
Random House Webster's College Dictionary
any of the five planets with orbits outside the orbit of Mars: Jupiter, Saturn, Uranus, Neptune, and Pluto.
Origin of outer planet:
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, 2014. Web. 23 Apr. 2014. <http://www.definitions.net/definition/outer planet>.