Definition of fetalization in US English:

fetalization

noun

  • Biology. The retention of juvenile characteristics in a species as an evolutionary phenomenon; neoteny, paedomorphosis. Frequently attributive Now chiefly historical.

Origin

Early 19th century (in an earlier sense). From fetal + -ization.

Pronunciation

fetalization

/ˌfiːt(ə)lʌɪˈzeɪʃn/