Definition of Sirius
: a star of the constellation Canis Major that is the brightest star in the heavens —called also Dog Star
Origin of sirius
Middle English, from Latin, from Greek Seirios
First Known Use: 14th century
Learn More about sirius
Britannica.com: Encyclopedia article about "Sirius"
Seen and Heard
What made you want to look up Sirius? Please tell us where you read or heard it (including the quote, if possible).