[poh-sahyd-n, puh-]
  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 2800 miles (4502 km).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for poseidon

Contemporary Examples of poseidon

Historical Examples of poseidon

British Dictionary definitions for poseidon


  1. Greek myth the god of the sea and of earthquakes; brother of Zeus, Hades, and Hera. He is generally depicted in art wielding a tridentRoman counterpart: Neptune
  2. a US submarine-launched ballistic missile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for poseidon



Greek god of the sea and earthquakes, Greek Poseidon (Doric Poteidan), of uncertain origin.

Online Etymology Dictionary, © 2010 Douglas Harper

poseidon in Culture



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

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.