American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of the four planets, Mercury, Venus, Earth, or Mars, that are nearest the sun and have similar size and density.
- n. Any planet of the solar system or any exoplanet which is "Earth-like" in the sense that it is composed primarily of metals and rock, in contrast to a planet which is a gas giant.
- n. a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system
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