Definition of "outer planet" []

• Any of the four planets, Jupiter, Saturn, Uranus, and Neptune, with orbits outside that of Mars. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "From Zanzibar Twenty-a small outer planet five thou­sand million miles from a minor sun-in the Zanzibar sys­tem, thirty light years from Earth and thus about twenty from the carrier, a stream of rock and minerals and dirt dug from the soil, loosened by robot mining equipment and funneled through the box, spouted across space and into the box aboard the carrier and was deflected into the fuel bins."