Short for a Caesarian section. In surgery, the word "section" refers to the division of tissue. Here, the division of tissue involves the abdominal wall of the mother and the wall of the uterus which are "sectionned" in order to deliver the baby from the uterus (womb).
SECTION (OBSTETRICAL)
Meaning of SECTION (OBSTETRICAL) in English
English dictionary of medicine. Английский словарь медицины. 2012