| placenta previa centralis | Placenta previa in which the placenta entirely covers the internal os of the cervix. Synonym: central placenta previa, total placenta previa. (05 Mar 2000) |
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| placenta previa marginalis | Placenta previa in which the placenta comes to the margin of, but does not occlude, the internal os of the cervix. (05 Mar 2000) |
| placenta previa partialis | Placenta previa in which the internal os of the cervix is partially covered by placental tissue. (05 Mar 2000) |
| placenta protein | human placental lactogen |
| placenta reflexa | An anomaly of the placenta in which the margin is thickened so as to appear turned back upon itself. See: placenta circumvallata, placenta marginata. (05 Mar 2000) |
| placenta reniformis | A kidney-shaped placenta. (05 Mar 2000) |
| placenta, retained | A placenta which is either adherent or incarcerated by irregular uterine contractions, and which in consequence fails to be expelled after birth. (12 Dec 1998) |
| placenta spuria | A mass of placental tissue which has no vascular connection with the main placenta. (05 Mar 2000) |
| placenta, succenturiate | An extra placenta separate from the main placenta. In anatomy succenturiate means accessory to an organ. In this case, a succenturiate placenta is an accessory placenta. (12 Dec 1998) |
| placenta, supernumerary | A succenturiate or accessory placenta. (12 Dec 1998) |
| placenta triloba | A placenta consisting of three parts almost entirely separate, being joined together only by the blood vessels of the umbilical cord; the foetus is single. Synonym: placenta triloba, placenta triplex. (05 Mar 2000) |
| placenta tripartita | A placenta consisting of three parts almost entirely separate, being joined together only by the blood vessels of the umbilical cord; the foetus is single. Synonym: placenta triloba, placenta triplex. (05 Mar 2000) |
| placenta triplex | A placenta consisting of three parts almost entirely separate, being joined together only by the blood vessels of the umbilical cord; the foetus is single. Synonym: placenta triloba, placenta triplex. (05 Mar 2000) |
| placenta uterina | <anatomy> The part of the placenta derived from the uterine tissue. See: placenta. Synonym: maternal placenta, placenta uterina. (05 Mar 2000) |
| placenta velamentosa | A placenta in which the umbilical cord is attached to the adjoining membranes, with the umbilical vessels spread out and entering the placenta independently. (05 Mar 2000) |