The Collaborative International Dictionary of English v.0.48:

Saturnian \Sa*tur"ni*an\, a. [L. Saturnius.]
   1. (Roman Myth.) Of or pertaining to Saturn, whose age or
      reign, from the mildness and wisdom of his government, is
      called the golden age.
      [1913 Webster]

   2. Hence: Resembling the golden age; distinguished for
      peacefulness, happiness, contentment.
      [1913 Webster]

            Augustus, born to bring Saturnian times. --Pope.
      [1913 Webster]

   3. (Astron.) Of or pertaining to the planet Saturn; as, the
      Saturnian year.
      [1913 Webster]

   Saturnian verse (Pros.), a meter employed by early Roman
      satirists, consisting of three iambics and an extra
      syllable followed by three trochees, as in the line: --
      Th[e^] qu[=e]en | w[a^]s [imac]n | th[e^] k[imac]tch |
      [e^]n [=e]at[i^]ng | br[=e]ad [a^]nd | h[=o]n[e^]y.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Saturnian \Sa*tur"ni*an\, n. (Zool.)
   Any one of numerous species of large handsome moths belonging
   to Saturnia and allied genera. The luna moth, polyphemus,
   and promethea, are examples. They belong to the Silkworn
   family, and some are raised for their silk. See Polyphemus.
   [1913 Webster]