/ Dictionary / Index S Sirius: Meaning and Definition of Find definitions for: Sir•i•us Pronunciation: (sir'ē-us), [key] — n. the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major. the dog of Orion. Icarius' faithful dog, who was changed into a star. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sirius (Thesaurus) siris sirloin Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language