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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Archipterygium  \Ar*chip`te*ryg"i*um\ 
  ([aum]r*k[i^]p`t[-e]*r[i^]j"[i^]*[u^]m),  n.  [NL.,  fr  Gr 
  pref.  'archi-  (E.  arch-)  +  ptery`gion  wing,  fin.]  (Anat.) 
  The  primitive  form  of  fin,  like  that  of  Ceratodus.