| SIHE | spontaneous intramural hematoma of the esophagus |
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| SIS | semantic indexing system; serotinin irritation syndrome; simian sarcoma; simulator-induced syndrome;... |
| SK | seborrheic keratosis; senile keratosis; Sloan-Kettering [Institute for Cancer Research]; spontaneous... |
| SLMC | spontaneous lymphocyte-mediated cytotoxicity |
| SMA | sequential multiple analysis or analyzer; sequential multichannel autoanalyzer; simultaneous multich... |
| epitheliochorial placenta | A placenta in which the chorion is merely in contact with, and does not erode, the endometrium. (05 Mar 2000) |
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| twin placenta | The placenta(s) of a twin pregnancy; if dizygotic, the placenta's may be separate or fused, the latter retaining two amniotic and two chorionic sacs (dichorionic diamniotic placenta); if monozygotic, the placenta may be a (05 Mar 2000) |
| zonary placenta | A placenta in the form of a band encircling the interior of the uterus. Synonym: zonary placenta. (05 Mar 2000) |
| labyrinthine placenta | A placenta in which maternal blood circulates through channels within the foetal syncytiotrophoblast. (05 Mar 2000) |
| foetal placenta | <embryology> Placenta foetalis, the chorionic portion of the placenta, containing the foetal blood vessels, from which the funis develops; specifically, in humans, it develops from the chorion frondosum. Synonym: pars foetalis placentae. (05 Mar 2000) |
| low placenta | Location of the placenta in the lower part of the uterus (womb) so that the placenta partially or completely covers the cervix. Also known as a placenta previa. (12 Dec 1998) |