Source : Webster's Revised Unabridged Dictionary (1913)

Aldebaran \Al*deb"a*ran\, n. [Ar. al-debar[=a]n, fr. dabar to
   follow; so called because this star follows upon the
   Pleiades.] (Astron.)
   A red star of the first magnitude, situated in the eye of
   Taurus; the Bull's Eye. It is the bright star in the group
   called the Hyades.

         Now when Aldebaran was mounted high Above the shiny
         Cassiopeia's chair.                      --Spenser.

Source : WordNet®

Aldebaran
     n : the brightest star in Taurus