Definition of Sirius in English:

Sirius

Line breaks: Sir¦ius
Pronunciation: /ˈsɪrɪəs
 
/
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'.

Definition of Sirius in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up