Source : Webster's Revised Unabridged Dictionary (1913)

Prenatal \Pre*na"tal\, a.
   Being or happening before birth.

Source : WordNet®

prenatal
     adj : occurring or existing before birth; "the prenatal period";
           "antenatal care" [syn: {antenatal}, {antepartum}] [ant:
            {perinatal}, {postnatal}]