follow Dictionary.com

How do you spell Hannukah?

inner planet

noun, Astronomy
1.
any of the four planets closest to the sun: Mercury, Venus, Earth, or Mars.
Also called terrestrial planet.
Compare outer planet.
Origin
1950-1955
1950-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for inner planets

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
Cite This Source
inner planets in Science
inner planet  
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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for inner planet

Few English speakers likely know this word

Word Value for inner

5
7
Scrabble Words With Friends