paedomorphosis

World English Dictionary
paedomorphosis (ˌpiːdəˈmɔːfəsɪs)
 
n
the resemblance of adult animals to the young of their ancestors: seen in the evolution of modern man, who shows resemblances to the young stages of australopithecines

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

paedomorphosis

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).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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