from the GNU version of the Collaborative International Dictionary of English

  • A group of fossil saurians having biconcave vertebræ and the teeth implanted in sockets.

from The Century Dictionary and Cyclopedia

  • A group of dinosaurs with thecodont dentition and amphicoelous vertebræ.

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

  • n. extinct terrestrial reptiles having teeth set in sockets; of the late Permian to Triassic


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