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[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.
Origin of eurypterid
1870-75; < New Latin Eurypteridae. See eury-, -pterous, -id2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for eurypterid
Historical Examples
  • The continuation of the dwindling process, already initiated in the eurypterid, would easily result in the tentacles of Ammocœtes.

    The Origin of Vertebrates Walter Holbrook Gaskell
British Dictionary definitions for eurypterid


any large extinct scorpion-like aquatic arthropod of the group Eurypterida, of Palaeozoic times, thought to be related to the horseshoe crabs
Word Origin
C19: from New Latin Eurypterida, from eury- + Greek pteron wing, feather
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for eurypterid

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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