As a noun afterpain is
(pathology|often in the plural) pain of uterine contractions experienced after childbirth (especially after passage of the placenta).
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Wikidiffcom has no English definition. It may be misspelled. afterpain
English
Noun
(
en noun)
(pathology, often in the plural) pain of uterine contractions experienced after childbirth (especially after passage of the placenta)