the ancient Greek god of the sea, with the power to cause earthquakes, identified by the Romans with Neptune.
2.
Military. a 34-foot (10-meter), submarine-launched U.S. ballistic missile with up to 10 warheads and a range of 2800 miles (4502 km).
British Dictionary definitions for Poseidon
Poseidon
/pɒˈsaɪdən/
noun
1.
(Greek myth) the god of the sea and of earthquakes; brother of Zeus, Hades, and Hera. He is generally depicted in art wielding a trident Roman counterpart Neptune
2.
a US submarine-launched ballistic missile
Word Origin and History for Poseidon
n.
Greek god of the sea and earthquakes, Greek Poseidon (Doric Poteidan), of uncertain origin.