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1. Oxford American Dictionary

   eurypterid

   • IPA[yəˈriptərid]

   美式

   • n.
     an extinct marine arthropod of a group occurring in the Paleozoic era. They are related to horseshoe crabs and resemble large scorpions with a terminal pair of paddle-shaped swimming appendages.

   • noun: eurypterid, plural noun: eurypterids