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paedomorphosis pae·do·mor·pho·sis or pe·do·mor·pho·sis (pē'də-môr'fə-sĭs)
n. pl. pae·do·mor·pho·ses (-sēz')
Phylogenetic change in which juvenile characteristics are retained in the adult form of an organism.
retention by an organism of juvenile or even larval traits into later life. There are two aspects of paedomorphosis: acceleration of sexual maturation relative to the rest of development (progenesis) and retardation of bodily development with respect to the onset of reproductive activity (neoteny).