Poseidon

noun

Po·​sei·​don pə-ˈsī-dᵊn How to pronounce Poseidon (audio)
: the Greek god of the sea compare neptune

Examples of Poseidon in a Sentence

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The broader package includes Boeing P8I Poseidon reconnaissance aircraft for its navy, anti-tank mines for its ground forces, and upgrades to its Soviet-era T-72 tanks and BMP-2 infantry fighting vehicles. Lim Hui Jie, CNBC, 13 Feb. 2026 Tactical nuclear arms like the Poseidon system were not covered by New START's provisions. Chris Boccia, ABC News, 5 Feb. 2026 Water from Poseidon’s Carlsbad plant costs San Diegans three times the water pumped from Northern California or the Colorado River. Doug Liden, San Diego Union-Tribune, 30 Jan. 2026 Lately, he’s been taken with his school’s unit on Greek mythology, imagining his own father as mighty Poseidon taking to the skies with trusty Pegasus. Angie Han, HollywoodReporter, 30 Jan. 2026 See All Example Sentences for Poseidon

Word History

Etymology

Latin, from Greek Poseidōn

First Known Use

1811, in the meaning defined above

Time Traveler
The first known use of Poseidon was in 1811

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Cite this Entry

“Poseidon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Poseidon. Accessed 14 Feb. 2026.

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