Noun cainogenesis has 1 sense
  1. cenogenesis, kenogenesis, caenogenesis, cainogenesis, kainogenesis - 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)
    --1 is a kind of growth, growing, maturation, development, ontogeny, ontogenesis
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