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

  • noun Any of various extinct marine reptiles of the group Plesiosauria of the Mesozoic Era, having paddlelike limbs, a short tail, and sometimes a very long neck.

from The Century Dictionary.

  • noun An animal of the order Plesiosauria.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Paleon.) One of the Plesiosauria.

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

  • noun Any of several extinct marine reptiles, of the order Plesiosauria, from the Jurassic and Cretaceous periods

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

  • noun extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous


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

[New Latin Plēsiosaurus, type genus : Greek plēsios, near to; see pel- in Indo-European roots + Greek sauros, lizard.]


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