Dog Star
WordNet
noun
(1) The brightest star in the sky; in Canis Major
WiktionaryText
Etymology
From the fact that the star lies in the constellation of Canis Major (the "larger dog")
Proper noun
- A bluish-white star in the constellation Canis Major; Alpha (α) Canis Majoris. 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.