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Poseidon (n.)

Greek god of the sea and earthquakes, one of the chief Olympians, a brother of Zeus, Greek Poseidon (Doric Poteidan), a name of uncertain origin. Related: Poseidonian.

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Definitions of Poseidon from WordNet

Poseidon (n.)
(Greek mythology) the god of the sea and earthquakes in ancient mythology; brother of Zeus and Hades and Hera; identified with Roman Neptune;
From wordnet.princeton.edu