Source : Webster's Revised Unabridged Dictionary (1913)

Antares \An*ta"res\, n. [Gr. ?; ? similar to + ? Mars. It was
   thought to resemble Mars in color.]
   The principal star in Scorpio: -- called also the {Scorpion's
   Heart}.

Source : WordNet®

Antares
     n : the brightest star in Scorpius