• WordNet 3.6
    • n afterpains pains felt by a woman after her baby is born; associated with contractions of the uterus
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Webster's Revised Unabridged Dictionary
    • n. pl Afterpains (Med) The pains which succeed childbirth, as in expelling the afterbirth.
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Century Dictionary and Cyclopedia
    • afterpains The uterine pains which occur in childbirth after the expulsion of the child and the afterbirth.
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Chambers's Twentieth Century Dictionary
    • n Afterpains aft′ėr-pānz the pains which succeed childbirth and the expulsion of the afterbirth.
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In literature:

The afterpains come on 3 or 4 hours later and expel the membranes, which should never be left longer than 24 hours.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture