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

They include Poseidon - a new intercontinental, nuclear armed and nuclear powered undersea autonomous torpedo, and also Burevestnik – a nuclear armed and powered cruise missile.

From BBC • Feb. 4, 2026

"Regarding the tests of Poseidon and Burevestnik, we hope that the information was conveyed correctly to President Trump," Kremlin spokesman Dmitry Peskov told journalists, referencing the names of Russian weapons.

From BBC • Nov. 3, 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

Poseidon winced as if he’d just been stabbed.

From "The Last Olympian" by Rick Riordan