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eurypterid

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WordReference Random House Unabridged Dictionary of American English © 2026

eu•ryp•ter•id n.

Paleontologyany aquatic arthropod of the extinct order Eurypterida, from the Paleozoic Era, closely related to trilobites and scorpions.

Neo-Latin Eurypteridae. See eury-, -pterous, -id²
1870–75

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