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

  • n. A large extinct marine reptile having paddlelike limbs that was common in Europe and North America during the Mesozoic Era.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the Plesiosauria.

from The Century Dictionary and Cyclopedia

  • n. An animal of the order Plesiosauria.

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

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


New Latin Plēsiosaurus, type genus : Greek plēsios, near to; see pel-5 in Indo-European roots + Greek sauros, lizard.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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