ALGOL

AL'GOL, noun A fixed star of the third magnitude, called Medusa's head, in Perseus; Long. 21 degrees 50' 42' of Taurus; Lat 23 degrees 23' 47' North.

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Al″gol (�), n. [[Ar. al-ghūl destruction, calamity, fr. ghāla to take suddenly, destroy.]] (Astron.) A fixed star, in Medusa's head, in the constellation Perseus, remarkable for its periodic variation in brightness.