Achelous ăk˝əlō´əs [key], in Greek mythology, river god; son of Oceanus and Tethys. He possessed the power to appear as a bull, a serpent, or a bullheaded man. Hercules defeated him and broke off one of his horns, which, according to one legend, became the cornucopia . He is sometimes said to be the father of the Sirens.
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