Definition of Sirius in English:

Sirius

Syllabification: Sir·i·us
Pronunciation: /ˈsi(ə)rēəs
 
/
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.

Definition of Sirius in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something