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

See Examples For:

Poseidon

But in another alteration, Damon’s Odysseus fires an arrow into the already blinded Cyclops’ eye as he escapes, giving the monster’s father, Poseidon, a new reason to make his journey home miserable.

From Los Angeles Times ● Jul. 21, 2026

Instead of Gods like Poseidon and Zeus playing an integral role in the story, they are left as unseen forces that motivate the characters’ actions.

From Salon ● Jul. 18, 2026

The angry sea god Poseidon is reduced to rumors; mighty Zeus withheld to a few well-timed thunderclaps.

From Los Angeles Times ● Jul. 15, 2026

High above, crews aboard P-8 Poseidon sub-hunting planes—specially modified Boeing 737 jetliners like those Southwest Airlines and Ryanair fly—can peer deep into the sea, launch probes and even fire anti-submarine weapons.

From The Wall Street Journal ● Feb. 11, 2026

We started at the Poseidon cabin, which was basically just me.

From "The Last Olympian" by Rick Riordan