Planet

n.
  1. (Astron.) A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See Solar system.
  2. A star, as influencing the fate of a men.
    3. Planet gear . (Mach.)
    See Epicyclic train, under Epicyclic.
    Planet wheel ,
    a gear wheel which revolves around the wheel with which it meshes, in an epicyclic train.