Etymology
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afterbirth (n.)

also after-birth, "placenta, etc., expelled from the uterus after birth," 1580s, perhaps based on older, similar Scandinavian compounds; see after + birth (n.). As "a birth after the death or last will of the father," 1875 (translating Latin agnatio in Roman law). Old English had æfterboren (adj.) "posthumous" in reference to birth.

updated on November 26, 2016

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Definitions of afterbirth from WordNet

afterbirth (n.)
the placenta and fetal membranes that are expelled from the uterus after the baby is born;
From wordnet.princeton.edu, not affiliated with etymonline.