cenogenesis

• POS: Noun
• HYPHEN: ce=no=gen=e=sis

CIDE DICTIONARY

cenogenesis, n. [Gr. new + E. genesis.].

 The 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); a 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.  [WordNet 1.5]