noun
: one of the five principal planets whose orbits are outermost in the solar system
Jupiter, Saturn, Uranus, Neptune, and Pluto are the outer planets
noun
: one of the five principal planets whose orbits are outermost in the solar system
Jupiter, Saturn, Uranus, Neptune, and Pluto are the outer planets
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012