Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n. An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus.

from The Century Dictionary and Cyclopedia

  • n. An American genus of extinct reptiles, of the order Sauropterygia, related to the plesiosaurs, but differing in the structure of the pectoral arch.

Etymologies

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