Poseidon

American  

[poh-sahyd-n, puh-] / poʊˈsaɪd n, pə- /

noun

1. 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 2,800 miles (4,502 km).

---

Poseidon British  

/ pɒˈsaɪdən /

noun

1. Roman counterpart: Neptune.  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

2. a US submarine-launched ballistic missile

---

Poseidon Cultural  

1. The Greek name for Neptune, the god in classical mythology who ruled the sea.

---

Example Sentences

Both the Poseidon and the Burevestnik are second-strike, retaliatory weapons, Mr Galeotti added - and not even the most rabid Kremlin propagandists are suggesting anyone is preparing to launch strikes on Russia.

From BBC • Oct. 31, 2025

Neither the Poseidon nor the Burevestnik were entirely novel - both had first been presented to the world in 2018 as part of a new array of weapons that Putin called "invincible".

From BBC • Oct. 31, 2025

The Pentagon has moved eight Navy warships, an attack submarine, F-35B jet fighters, P-8 Poseidon spy planes and MQ-9 Reaper drones into the region.

From The Wall Street Journal • Oct. 21, 2025

Since August, the Pentagon has deployed three guided-missile destroyers, F-35B jet fighters, MQ-9 Reaper drones, P-8 Poseidon spy planes, assault ships and a secretive special-operations ship.

From The Wall Street Journal • Oct. 14, 2025

Ares, God of War, always took sides with Aphrodite; while Poseidon, Lord of the Sea, favored the Greeks, a sea people, always great sailors.

From "Mythology: Timeless Tales of Gods and Heroes" by Edith Hamilton