Century Dictionary and Cyclopedia
- n. Vitiated evolution, as distinguished from hereditary evolution; ontogenesis modified by adaptation, and therefore not true to its type; that development of an individual germ which does not truly epitomize and repeat the phylogenetic evolution of its race or stock: the opposite of palingenesis. See biogeny. Also kenogeny.
- n. Alternative form of caenogenesis.
GNU Webster's 1913
- n. (Biol.) 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
- n. 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)
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