from the GNU version of the Collaborative International Dictionary of English
- n.pl. 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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