Plan·et·a·ry a.
 1. Of or pertaining to the planets; as, planetary inhabitants; planetary motions; planetary year.
 2. Consisting of planets; as, a planetary system.
 3. Astrol. Under the dominion or influence of a planet. “Skilled in the planetary hours.”
 4. Caused by planets. “A planetary plague.”
 5. Having the nature of a planet; erratic; revolving; wandering. “Erratical and planetary life.”
 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.

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