Dictionary![]() ![]() Sir•i•usPronunciation: (sir'ē-us), [key] —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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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