cen`o*gen"e*sisn. [Gr. new + E. genesis.] (Biol.) 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 + 1913 Webster]
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Fri 14th December 2018