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eurypterid
eurypterid definition
eu·ryp·terid (yo̵̅o̅ rip′tər id′)
noun
any of an extinct order (Eurypterida) of large, aquatic arthropods of the Paleozoic Era, similar to the horseshoe crab and sometimes reaching a length of c. 1.8 m (c. 6 ft)
Etymology: < ModL Eurypterida < Gr eurys, broad + pteron, feather, wing: so named from a pair of broad swimming appendages
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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