- The brightest star in the sky, south of the celestial equator in the constellation Canis Major. It is a binary star with a dim companion, which is a white dwarf. Also called Dog Star.
Latin, from Greek seirios astēr 'scorching star', because it rose with the sun in the heat of summer. See dog days.
More definitions of SiriusDefinition of Sirius in:
- The British & World English dictionary