Poseidon
Americannoun
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the ancient Greek god of the sea, with the power to cause earthquakes, identified by the Romans with Neptune.
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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).
noun
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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
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a US submarine-launched ballistic missile
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
On 15 May, two US MQ-4C Triton surveillance drones also operated off the coast of southern Cuba, with tracking showing them operating along a route similar to one previously flown by a Poseidon.
From BBC • May 20, 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
The U.S. brought in P-8 Poseidon “sub-hunter” aircraft and AC-130J gunships to help with the boarding operation of the ship south of Iceland, according to flight-tracking data and two U.S. officials.
From The Wall Street Journal • Jan. 7, 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
It thrashed and fought, but Poseidon just sighed.
From "The Last Olympian" by Rick Riordan
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
