Dog Star
proper noun
- binary star system in the constellation of Canis Major
Wiktionary
name
Etymology: From the fact that the star lies in the constellation of Canis Major (the "larger dog").
- A bluish-white star in the constellation Canis Major; Alpha (α) Canis Majoris A. A vertex of the Winter Triangle and the brightest star in the night sky. It is actually a binary star with a white dwarf companion star.