| placental septa | Incomplete partitions between placental cotyledons; they are covered with trophoblast and contain a core of maternal tissue. (05 Mar 2000) |
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| placental sign | <clinical sign> Slight endometrial oozing of blood which occurs in certain animals and sometimes in women at the time of implantation of the fertilised ovum; in women, if the blood appears externally it may be mistaken for a scanty menstrual period. (05 Mar 2000) |
| placental site trophoblastic tumour | A tumour usually arising in the uterus of parous women during reproductive years. Histologically, the tumour consists of a predominance of intermediate trophoblastic cells with fibrinoid material and vascular invasion. (05 Mar 2000) |
| placental souffle | A blowing sound, synchronous with the cardiac systole of the mother, heard on auscultation of the pregnant uterus. Synonym: placental souffle. (05 Mar 2000) |
| placental stage of labour | The part of labour from the birth of the baby until the placenta (afterbirth) and foetal membranes are delivered. Also called the third stage of labour. (12 Dec 1998) |
| placental sulfatase deficiency | <enzyme> An enzyme defect in the placenta which results in failure of conversion of 16a-hydroxydehydroepiandrosterone to estriol; women with this condition rarely enter into spontaneous labour. (05 Mar 2000) |
| placental thrombosis | Thrombosis of the veins of the uterus at the placental site. (05 Mar 2000) |
| placental transfusion | Return to the newborn via the umbilical vessels some of the foetal placental blood. (05 Mar 2000) |
| placentalia | <zoology> A division of Mammalia including those that have a placenta, or all the orders above the marsupials. Source: Websters Dictionary (01 Mar 1998) |
| placentascan | An obsolete method of determining the location of the placenta by means of injected radioactive material and its localization and display by a scintillation detector. (05 Mar 2000) |
| placentation | <zoology> In mammals, the process of a placenta forming during gestation. <plant biology> In plants, the arrangement of placentas, and hence of ovules, within an ovary. (31 Dec 1997) |