placenta previa placenta pre·vi·a (prē'vē-ə)
A condition in which the placenta is implanted in the lower segment of the uterus so that it is adjacent to or obstructs the internal opening of the cervix. It may cause maternal hemorrhage prior to or during labor. Also called placental presentation.
|pregnancy in which the placenta is implanted in the lower part of the uterus (instead of the upper part); can cause bleeding late in pregnancy; delivery by cesarean section may be necessary|