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1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Algol \Al"gol\, n. [Ar. al-gh[=u]l destruction, calamity, fr.
      gh[=a]la to take suddenly, destroy.] (Astron.)
      A fixed star, in Medusa's head, in the constellation Perseus,
      remarkable for its periodic variation in brightness.
      [1913 Webster]