Definition of Sirius in English:

Sirius

Syllabification: Sir·i·us
Pronunciation: /ˈsirēəs
 
/
Astronomy
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.

Origin

Latin, from Greek seirios astēr 'scorching star', because it rose with the sun in the heat of summer. See dog days.

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Word of the day oleaginous
Pronunciation: ˌōlēˈajənəs
adjective
rich in, covered with, or producing oil; oily