mean planet

American  

noun

Astronomy.

1. a hypothetical planet that coincides with a real planet when the real planet is at perihelion and that moves in an orbit at a constant velocity equal to the mean velocity of the real planet.

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Example Sentences

Not that Eisberg is a really mean planet; Jupiter, Saturn, Uranus, or Neptune can kill a man faster and with less pain.

From Unwise Child by Garrett, Randall