Al*deb"a*ran (&?;), n. [Ar. al- debarān, 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.

• A binary star in the constellation Taurus, an orange giant, 68 light-years from Earth, and one of the brightest stars in the sky