[yoo-rip-tuh-rid, yuh-]


any aquatic arthropod of the extinct order Eurypterida, from the Paleozoic Era, closely related to trilobites and scorpions.

Origin of eurypterid

From the New Latin word Eurypteridae, dating back to 1870–75. See eury-, -pterous, -id2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for eurypterid

Historical Examples of eurypterid

  • 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 for eurypterid

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

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