Definitions for caenogenesis
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Princeton's WordNet
cenogenesis, kenogenesis, caenogenesis, cainogenesis, kainogenesis(noun)
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)
Wiktionary
caenogenesis(Noun)
The embryotic development of cross-species structures or characteristics.
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"caenogenesis." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/caenogenesis>.