neonatalPronunciation: /ˌniːə(ʊ)ˈneɪt(ə)l/Definition of neonatal adjective relating to newborn children (or other mammals): special attention is given to mortality in the neonatal periodDerivatives neonatally adverb neonatologist noun neonatology noun neonatal in other Oxford dictionaries Definition of neonatal in the US English dictionary