| Dog Star (n.) Sirius, a star of the constellation Canis Major, or the Greater Dog, and the brightest star in the heavens; -- called also Canicula, and, in astronomical charts, / Canis Majoris. See Dog days. Thesaurus Entries Aldebaran, Canicula, Dog Star, Hesper, Hesperus, Lucifer, North Star, Phosphor, Phosphorus, Polaris, Sirius, Venus, Vesper, celestial body, daystar, evening star, fixed stars, heavenly body, living sapphires, lodestar, morning star, orb, polar star, polestar, sphere, starry host, stars |