cros·sop·ter·yg·ian /ˌkrɔˌsɑptəˈrɪʤ(i)ən/
  Cros·sop·ter·yg·i·an a. Zool. Of or pertaining to the Crossopterygii. -- n. One of the Crossopterygii.
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  crossopterygian
       n : any fish of the order Crossopterygii; most known only in
           fossil form [syn: lobefin, lobe-finned fish]