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  1  definition  found 
 
  From  WordNet  r  1.6  [wn]: 
 
  cenogenesis 
  n  :  introduction  during  embryonic  development  of  characters  or 
  structure  not  present  in  the  earlier  evolutionary  history 
  of  the  strain  or  species  (as  addition  of  the  placenta  in 
  mammalian  evolution)  [syn:  {kenogenesis},  {caenogenesis}, 
  {cainogenesis},  {kainogenesis}]  [ant:  {palingenesis}] 

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