paedogenesis
noun
pae·do·gen·e·sis ˌpē-dō-ˈje-nə-səs 
variants or less commonly pedogenesis
: reproduction by young or larval animals : neoteny
paedogenetic
ˌpē-dō-jə-ˈne-tik
adjective or paedogenic
ˌpē-dō-ˈje-nik
paedogenetically
ˌpē-dō-jə-ˈne-ti-k(ə-)lē
adverb 
Word History
Etymology
New Latin
First Known Use
1870, in the meaning defined above
Medical Definition
paedogenesis
noun
pae·do·gen·e·sis
variants also pedogenesis
ˌpēd-ō-ˈjen-ə-səs
plural paedogeneses -ˌsēz
: reproduction by young or larval animals