[yoo-rip-tuh-rid, yuh-] /yʊˈrɪp tə rɪd, yə-/

any aquatic arthropod of the extinct order Eurypterida, from the Paleozoic Era, closely related to trilobites and scorpions.
any large extinct scorpion-like aquatic arthropod of the group Eurypterida, of Palaeozoic times, thought to be related to the horseshoe crabs

fossil swimming crustacean of the Silurian and Devonian, 1874, from Greek eurys “broad, wide” (see aneurysm) + pteron “feather, wing” (see pterodactyl); so called from their swimming appendages.


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