/sir"ee euhs/ , n.
1. Astron. the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major.
2. Also, Seirios . Class. Myth.
a. the dog of Orion.
b. Icarius' faithful dog, who was changed into a star.
[ 1325-75; ME Sirius Seírios ]