SINCE 1828
eurypterid
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
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