After seeing Sirius Black at his worst, Marlene McKinnon thinks she understands why he is the way he is. But that doesn't mean the boy will let his guard down for this girl who suddenly wants to help him fix himself. Sirius (noun) 1. Astronomy. the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major. Marlene (noun) 1. It is of German, Latin and Greek origin; meaning "star of the sea''; from Magdala.All Rights Reserved