Antares Definition
 ăn-târēz, -tăr- 
    noun
  
 A giant red binary star, the brightest in the constellation Scorpio, about 424 light years from Earth.
 American Heritage 
A red, supergiant, binary, variable star, the brightest star in the constellation Scorpius: magnitude, 1.06
 Webster's New World 
    pronoun
  
 (astronomy) A proper name for Alpha Scorpii (α Sco), the brightest star in the constellation Scorpius. It is a M type red giant, and is a binary with a B type companion visible in greenish.
Wiktionary 
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