eu·ryp·ter·id
| \ yu̇-ˈrip-tə-rəd
\
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Definition of eurypterid
: any of an order (Eurypterida) of usually large aquatic Paleozoic arthropods resembling scorpions and related to the horseshoe crabs
— called also sea scorpion
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“Eurypterid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eurypterid. Accessed 25 Feb. 2021.
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Time Traveler for eurypterid
The first known use of eurypterid was in 1871
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