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2 definitions found
 for Planetary nebula
From The Collaborative International Dictionary of English v.0.48 :

  Planetary \Plan"et*a*ry\, a. [Cf. L. planetarius an astrologer,
     F. plan['e]taire 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.
     Planetary nebula, a nebula exhibiting a uniform disk, like
        that of a planet.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  planetary nebula
      n 1: a nebula that was once thought to be a star with its
           planets but is now thought to be a very hot star surrounded
           by an expanding envelope of ionized gases that emit a
           fluorescent glow because of intense radiation from the star

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