styx

/stɪks/
noun
  1. In Greek mythology, the river that souls must cross to enter the underworld, often associated with death and the afterlife.
    • Many poems describe the dark, gloomy waters of the Styx.
    • The hero Achilles was dipped in the river Styx to make him invulnerable.
    • In ancient stories, the ferryman Charon carried souls across the river Styx.
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