inner planet Hear it!

inner planet definition

inner planet

any of the four planets closest to the sun; Mercury, Venus, Earth, or Mars

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.