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Any of various large segmented aquatic arthropods of the order Eurypterida that existed from the Ordovician Period to the Permian Period, having a long tail often with a spinelike appendage at the tip. Also called sea scorpion.
[From New Latin Eurypterida, order name, from Eurypterus, genus name : eury- + Greek pteron, wing; see -pter.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Animals) any large extinct scorpion-like aquatic arthropod of the group Eurypterida, of Palaeozoic times, thought to be related to the horseshoe crabs
[C19: from New Latin Eurypterida, from eury- + Greek pteron wing, feather]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
eu•ryp•ter•id(yʊˈrɪp tə rɪd, yə-)
any extinct aquatic arthropod of the Paleozoic order Eurypterida, related to horseshoe crabs.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||eurypterid - large extinct scorpion-like arthropod considered related to horseshoe crabs|
arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
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