from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of the four planets, Mercury, Venus, Earth, and Mars, whose orbits are closest to the sun.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any planet of the
solar systemor any exoplanetwhich is " Earth -like" in the sense that it is composed primarily of metalsand rock, in contrast to a planet which is a gas giant.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system
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