plesiosaur[plē′sē ə sôr′]
any of an extinct group (order Sauropterygia) of large water reptiles of the Mesozoic Era, characterized by a small head, long neck, short tail, and four paddlelike limbs
Origin of plesiosaur; from Modern Latin Plesiosaurus ; from Classical Greek plēsios, close, near, akin to pelos, near (prob. ; from Indo-European base an unverified form pel-, to push from source felt, Classical Latin pellere, to drive) + -saur
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.
Origin of plesiosaurNew Latin Plēsiosaurus, type genus : Greek plēsios, near to; see pel-5 in Indo-European roots + Greek sauros, lizard.
plesio- + -saur