terrestrial planet

terrestrial planet

n.

Any of the four planets, Mercury, Venus, Earth, or Mars, that are nearest the sun and have similar size and density.

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terrestrial planet

See inner planet.

Thesaurus

Noun

1.

terrestrial planet - a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar system major planet, planet - (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction