The Collaborative International Dictionary of English v.0.48:

Uranus \U"ra*nus\ (-n[u^]s), n. [L. Uranus, Gr. O'yrano`s
   Uranus, o'yrano`s heaven, sky. Cf. Uranium.]
   [1913 Webster]
   1. (Gr. Myth.) The son or husband of Gaia (Earth), and father
      of Chronos (Time) and the Titans.
      [1913 Webster]

   2. (Astron.) One of the primary planets. It is about
      1,800,000,000 miles from the sun, about 36,000 miles in
      diameter, and its period of revolution round the sun is
      nearly 84 of our years.
      [1913 Webster]

   Note: This planet has also been called Herschel, from Sir
         William Herschel, who discovered it in 1781, and who
         named it Georgium Sidus, in honor of George III.,
         then King of England.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Herschel \Her"schel\, n. (Astron.)
   See Uranus.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Herschel
    n 1: English astronomer (son of William Herschel) who extended
         the catalogue of stars to the southern hemisphere and did
         pioneering work in photography (1792-1871) [syn:
         Herschel, John Herschel, Sir John Herschel, Sir John
         Frederick William Herschel]
    2: English astronomer (born in Germany) who discovered infrared
       light and who catalogued the stars and discovered the planet
       Uranus (1738-1822) [syn: Herschel, William Herschel, Sir
       William Herschel, Sir Frederick William Herschel]