Webster's English Dictionary

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planet

plan.et \'plan-*t\ n [ME planete, fr. OF, fr. LL planeta, modif. of Gk 
   plane-t-], plane-s, lit., wanderer, fr. planasthai to wander; akin to ON 
   flana to rush around 1a: any of the seven heavenly bodies sun, moon, Venus, 
   Jupiter, Mars, Mercu ry, and Saturn that in ancient belief have motions of 
   their own among the fixed stars 1b: one of the bodies except a comet, 
   meteor, or satellite that revolves ar ound the sun in the solar system; 
   specif : EARTH 2: a heavenly body held to influence the fate of human 
   beings  3: a person or thing of great importance : LUMINARY