The Collaborative International Dictionary of English v.0.48:
Prenatal \Pre*na"tal\, a. Being or happening before birth. [1913 Webster]WordNet (r) 3.0 (2006):
prenatal adj 1: occurring or existing before birth; "the prenatal period"; "antenatal care" [syn: prenatal, antenatal, antepartum] [ant: perinatal, postnatal, postpartum]