edaphosaurus

from WordNet (r) 3.0 (2006)
edaphosaurus
    n 1: heavy-bodied reptile with a dorsal sail or crest; of the
         late Paleozoic
from The Collaborative International Dictionary of English v.0.48
edaphosaurus \edaphosaurus\ n.
   an extinct heavy-bodied reptile of the late Paleozoic having
   a dorsal sail or crest.
   [WordNet 1.5]
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