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[sir-ee-uh s] /ˈsɪr i əs/
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.
1325-75; Middle English < Latin Sīrius < Greek Seírios Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Sirius


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 years Also called the Dog Star, Canicula, Sothis, related adjectives canicular cynic
Word Origin
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
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Word Origin and History for Sirius
brightest star, late 14c., from Gk. Seirios, lit. "scorching." Probably so called from its ancient heliacal rising at the summer solstice (see dog days). An Egyptian name for it was Sothis.
Online Etymology Dictionary, © 2010 Douglas Harper
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Sirius in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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