Definition of placenta in English:



  • 1A flattened circular organ in the uterus of pregnant eutherian mammals, nourishing and maintaining the fetus through the umbilical cord.

    • ‘Folic acid also is crucial to support the rapid growth of the placenta and fetus.’
    • ‘The baby is connected to the umbilical cord, the umbilical cord to the placenta, and the placenta to the mother, at least at this stage of the proceedings.’
    • ‘Placenta accreta is a placenta that implants too deeply and too firmly into the uterine wall.’
    • ‘She could also transmit the infection to the fetus across the placenta.’
    • ‘It most likely functions as an adhesion protein, connecting the placenta to the uterus.’
    • ‘We felt that compared with placentas with focal lesions, placentas with well-established HEV would more reliably reflect associated events.’
    • ‘These help to anchor it to the lining of the uterus and will eventually grow into the placenta, the organ that feeds and protects the baby until birth.’
    • ‘Transplanting cord blood stem cells from placenta and umbilical cords have the same effect as a bone-marrow transplant.’
    • ‘This transformation is essential to ensure a normal blood supply to the fetus and placenta throughout pregnancy.’
    • ‘New alternatives, which are currently experimental, include harvesting stem cells from umbilical cord blood or placentas of new born babies.’
    • ‘The sonographer scans the patient, taking an initial assessment of the fetuses, the placenta, and the amniotic cavity.’
    • ‘Causes of spontaneous abortion may relate to the fetus, the placenta, or the uterus.’
    • ‘Alcohol enters the fetus readily through the placenta and is eliminated by maternal metabolism.’
    • ‘In each later pregnancy, maternal Rh antibodies can cross the placenta and reach the fetus.’
    • ‘We analyzed tissues from 368 specimens of pregnancy loss and 219 placentas of live-born infants using CGH.’
    • ‘The placenta connects the baby's blood supply to the mother's blood.’
    • ‘Chorioangiopagus vessels are vessels that join the fetuses in the placenta.’
    • ‘In most pregnant women, the placenta forms and grows just as it should.’
    • ‘He explores how cocaine destroys the placenta, the fetus, and the infant's life.’
    • ‘The mother had an aggressive metastatic disease, and the cancer could have spread across the placenta to the fetus.’
  • 2Botany
    (in flowers) part of the ovary wall to which the ovules are attached.

    • ‘In both species the gametophytic cells of the placenta generally have less prominent wall labyrinths than sporophytic cells.’
    • ‘As the ovary elongates only above the placenta, the ovules appear basal at anthesis.’
    • ‘The ovary has axile intruded placentae with around 250-350 ovules.’
    • ‘The entire placenta with attached ovules was removed via a longitudinal incision in the ovary wall.’
    • ‘Partial view of flower and dissected gynoecium with two placentas.’


Late 17th century: from Latin, from Greek plakous, plakount- ‘flat cake’, based on plax, plak- ‘flat plate’.