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Synecephalus - A rare type of conjoined twin in which the twins share a head and face, but have four ears and and two bodies.
Syntocinon - A synthetic form of oxytocin that can be given to a pregnant woman to speed up labor during a vaginal birth. The medication is administered through an IV and like pitocin, the medication can make uterine contractions very strong.
Syphilis - An infectious bacterial disease that is transmitted through sexual contact or other infected bodily fluids. An individual will notice the first symptoms appear apporximately 12 to 30 days after coming in contact with the disease, The microorganisms can cross the placenta and infect the developing fetus.
Syringoma - A small, subcutaneous benign tumor of sweat glands that generally appears in multiples. The tumors usually appear on the lower eyelids, cheeks and vulva.
Systolic - The top number of a blood pressure reading. The systolic reading measures the maximum amount of blood pressure as the blood is pumped out of the heart chambers. A good, healthy value is approximately 120.