epigenesis definition, epigenesis meaning | English dictionary

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1    the widely accepted theory that an individual animal or plant develops by the gradual differentiation and elaboration of a fertilized egg cell  
   Compare       preformation       2  
2    the formation of ore deposits after the surrounding rock has been formed  
3    alteration of the mineral composition of a rock by external agents: a type of metamorphism  
  epigenesist, epigenist      n  
  epigenetic      adj  
  epigenetically      adv  
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