Scorpius Syllabification: (Scor·pi·us)Pronunciation: /ˈskôrpēəs/ AstronomyDefinition of Scorpius a large constellation (the Scorpion). It contains the red giant Antares. (as genitive Scorpii /ˈskôrpēˌī, -ˌē/) used with a preceding letter or numeral to designate a star in this constellation:the star Theta ScorpiiOrigin:LatinScorpius in other Oxford dictionaries Definition of Scorpius in the British & World English dictionary