Sirius

[ sir-ee-uh s ]
/ ˈsɪr i əs /

noun

Astronomy. the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major.
Also Seirios. Classical Mythology.
  1. the dog of Orion.
  2. Icarius' faithful dog, who was changed into a star.

Origin of Sirius

1325–75; Middle English < Latin Sīrius < Greek Seírios
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sirius

Sirius
/ (ˈsɪrɪəs) /

noun

the brightest star in the sky after the sun, lying in the constellation Canis Major. It is a binary star whose companion, Sirius B, is a very faint white dwarf. Distance: 8.6 light yearsAlso called: the Dog Star, Canicula, Sothis Related adjectives: canicular, cynic

Word Origin for Sirius

C14: via Latin from Greek Seirios, of obscure origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for sirius

Sirius
[ sĭrē-əs ]

The brightest star seen in the night sky. It is in the constellation Canis Major. It is a white main-sequence star on the Hertzsprung-Russell diagram, with an apparent magnitude of -1.5. Sirius is a binary star, and its companion is a white dwarf star referred to as the Pup. Sirius is also known as the Dog Star. Scientific name: Alpha Canis.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.