Aldebaran Syllabification: (Al·deb·a·ran)Pronunciation: /alˈdebərən/Definition of Aldebaran the brightest star in the constellation Taurus. It is a binary system of which the main star is a red giant. Origin:Arabic, 'the follower (of the Pleiades)'Aldebaran in other Oxford dictionaries Definition of Aldebaran in the British & World English dictionary