1A northern constellation (the Herdsman), said to represent a man holding the leash of two dogs (Canes Venatici) while driving a bear (Ursa Major). It contains the bright star Arcturus.

1. 1.1as genitive Boötis /bəʊˈəʊtɪs/ Used with preceding letter or numeral to designate a star in the constellation Boötes.
   the star Gamma Boötis