ictodosaur

from WordNet (r) 3.0 (2006)
ictodosaur
    n 1: intermediate in form between the therapsids and most
         primitive true mammals
from The Collaborative International Dictionary of English v.0.48
ictodosaur \ictodosaur\ n.
   An extinct reptile intermediate in form between the
   therapsids and most primitive true mammals.
   [WordNet 1.5]
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