a. [ Cf. L. planetarius an astrologer, F. planétaire planetary. See Planet. ] 1. Of or pertaining to the planets; as, planetary inhabitants; planetary motions; planetary year. [ 1913 Webster ]
2. Consisting of planets; as, a planetary system. [ 1913 Webster ]
3. (Astrol.) Under the dominion or influence of a planet. “Skilled in the planetary hours.” Drayton. [ 1913 Webster ]
4. Caused by planets. “A planetary plague.” Shak. [ 1913 Webster ]
5. Having the nature of a planet; erratic; revolving; wandering. “Erratical and planetary life.” Fuller. [ 1913 Webster ]
Planetary days, the days of the week as shared among the planets known to the ancients, each having its day. Hutton. --
Planetary nebula, a nebula exhibiting a uniform disk, like that of a planet. [ 1913 Webster ]