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eurypterid

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noun eu·ryp·ter·id \ yu̇-ˈrip-tə-rəd \

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
—

eurypterid

adjective

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Origin and Etymology of eurypterid

ultimately from Greek eury- + pteron wing — more at feather

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