inner planet

[ in-er plan-it ]
See synonyms for inner planet on Thesaurus.com
nounAstronomy.
  1. any of the planets in our solar system whose orbits lie between the sun and the asteroid belt, namely, Mercury, Venus, Earth, and Mars, all of which are terrestrial planets.

Origin of inner planet

1
First recorded in 1950–55

Words Nearby inner planet

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use inner planet in a sentence

  • Meadows began to play inner planet combinations that occasionally paid, though at short odds.

    Fee of the Frontier | Horace Brown Fyfe
  • "The most probable one is the next inner planet, Aphrodite," replied Morey.

    Islands of Space | John W Campbell
  • The inner planet revolved about it with one side glowing low red heat and the other side piled high with frozen atmosphere.

    Talents, Incorporated | William Fitzgerald Jenkins

British Dictionary definitions for inner planet

inner planet

noun
  1. any of the planets Mercury, Venus, earth, and Mars, whose orbits lie inside 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

Scientific definitions for inner planet

inner planet

  1. Any of the four planets Mercury, Venus, Earth, and Mars, whose orbits lie nearest the Sun. The inner planets are of similar size and have high densities compared to the larger gas giants among the outer planets. They are composed mostly of rock and metal and are relatively slow to rotate, with solid surfaces, no rings, and few moons. Also called terrestrial planet Compare outer planet. See also inferior planet.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.