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Noun: cenogenesis  ,see-nu'je-nu-sis
  1. Introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution)
    - kenogenesis, caenogenesis, cainogenesis, kainogenesis

Type of: development, growing, growth, maturation, ontogenesis, ontogeny

Antonym: palingenesis

Encyclopedia: Cenogenesis