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[plee-see-uh-sawr] /ˈpli si əˌsɔr/

any marine reptile of the extinct genus Plesiosaurus, from the Jurassic and Cretaceous periods, having a small head, a long neck, four paddlelike limbs, and a short tail.
any of various extinct marine reptiles of the order Sauropterygia, esp any of the suborder Plesiosauria, of Jurassic and Cretaceous times, having a long neck, short tail, and paddle-like limbs See also ichthyosaur Compare dinosaur, pterosaur
Any of various large, extinct marine reptiles of the genus Plesiosaurus and related genera of the Mesozoic Era. Most plesiosaurs had a small head on a long neck and a broad body with paddlelike limbs; one group had a large head on a short neck. The exact relationship between plesiosaurs and other reptiles is not known.


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  • Plesiosaurus

    n. 1825, from Modern Latin Pleisiosaurus (1821), coined by English paleontologist William Daniel Conybeare (1787-1857) from Greek plesios “near,” related to pelas, + -saurus.

  • Plessimeter

    plessimeter ples·sim·e·ter (plě-sĭm’ĭ-tər) n. Variant of pleximeter.

  • Plessor

    [ples-er] /ˈplɛs ər/ noun, Medicine/Medical. 1. . /ˈplɛsə/ noun 1. another name for plexor plessor ples·sor (plěs’ər) n. Variant of plexor.

  • Plessy versus ferguson

    Plessy versus Ferguson [(ples-ee, fur-guh-suhn)] A case decided by the Supreme Court in the 1890s. The Court held that a state could require racial segregation in public facilities if the facilities offered the two races were equal. The Court’s requirement became known as the “separate but equal” doctrine. It was overturned by the Court in […]

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