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
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
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
Flights of B1 bombers and P-8 Poseidon spy planes have also been visible on plane tracking platforms.
From BBC • Oct. 23, 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.
