Definitions for afterpainˈæf tərˌpeɪn, ˈɑf-
Random House Webster's College Dictionary
af•ter•painˈæf tərˌpeɪn, ˈɑf-(n.)
any discomfort arising from the normal contractions of the uterus following childbirth, sometimes continuing for several days postpartum.
Origin of afterpain:
pain of uterine contractions experienced after childbirth (especially after passage of the placenta)