cainogenesis

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WordNet Dictionary
	Definition:		[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)
	Synonyms:		caenogenesis, cenogenesis, kainogenesis, kenogenesis
	Antonyms:		palingenesis, recapitulation
	See Also:		development, growing, growth, maturation, ontogenesis, ontogeny