Hypertext Webster Gateway: "cenogenesis"
From WordNet (r) 1.7 (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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