Source : Webster's Revised Unabridged Dictionary (1913)

Saturn \Sa"turn\, n. [L. Saturnus, literally, the sower, fr.
   serere, satum, to sow. See {Season}.]
   1. (Roman Myth.) One of the elder and principal deities, the
      son of C[oe]lus and Terra (Heaven and Earth), and the
      father of Jupiter. The corresponding Greek divinity was
      Kro`nos, later CHro`nos, Time.

   2. (Astron.) One of the planets of the solar system, next in
      magnitude to Jupiter, but more remote from the sun. Its
      diameter is seventy thousand miles, its mean distance from
      the sun nearly eight hundred and eighty millions of miles,
      and its year, or periodical revolution round the sun,
      nearly twenty-nine years and a half. It is surrounded by a
      remarkable system of rings, and has eight satellites.

Source : WordNet®

Saturn
     n 1: a giant planet which is surrounded by three planar
          concentric rings of ice particles; 6th planet from the
          sun
     2: (Roman mythology) god of agriculture and vegetation;
        counterpart of Greek Cronus; "Saturday is Saturn's Day"