Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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.

from The Century Dictionary.

  • noun A merostome crustacean of the family Eurypteridæ.
  • Having the characters of or pertaining to Eurypterus or the Eurypteridæ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A large, prehistoric, carnivorous arthropod, of the order Eurypterida, thought to be one of the first animals to venture onto land.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun large extinct scorpion-like arthropod considered related to horseshoe crabs

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From New Latin Eurypterida, order name, from Eurypterus, genus name : eury– + Greek pteron, wing; see –pter.]

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