placenta previa

noun
placenta pre·​via | \-ˈprē-vē-ə \
plural placentae previae\-​vē-​ˌē \

Medical Definition of placenta previa 

: an abnormal implantation of the placenta at or near the internal opening of the uterine cervix so that it tends to precede the child at birth usually causing severe maternal hemorrhage

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