KENOGENESIS

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)

Source: WordNet® 3.1

Noun

kenogenesis (uncountable)

Alternative form of caenogenesis

Source: Wiktionary

Ken`o*gen"e*sis, n. Etym: [Gr. genesis.] (Biol.)

Definition: Modified evolution, in which nonprimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment; -- distinguished from palingenesis. [Written also cænogenesis.]

Source: Webster’s Unabridged Dictionary 1913 Edition

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