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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Kenogenesis  \Ken`o*gen"e*sis\,  n.  [Gr.  ?  new  +  E.  genesis.] 
  (Biol.) 
  Modified  evolution,  in  which  nonprimitive  characters  make 
  their  appearance  in  consequence  of  a  secondary  adaptation  of 
  the  embryo  to  the  peculiar  conditions  of  its  environment;  -- 
  distinguished  from  palingenesis.  [Written  also 
  {c[ae]nogenesis}.] 
 
  From  WordNet  r  1.6  [wn]: 
 
  kenogenesis 
  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:  {cenogenesis},  {caenogenesis}, 
  {cainogenesis},  {kainogenesis}]  [ant:  {palingenesis}] 

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