Definition of "Sirius"
Sirius
/ˈsɪɹi.əs/
proper noun
(astronomy) A white main sequence star, the primary star of the star system, the only star of the pair that is visible to the naked eye. Long understood as a single extremely luminous white star, it was associated in ancient Egypt with the Nile flood and in Greek and Roman culture with the "dog days" of summer.