1 Electromagnetic coil, formed when a conductor is wound around a core or form to create an inductor or electromagnet.  Ignition coil, an electromagnetic induction coil used in internal combustion engines to create a pulse of high voltage for a spark plug.
systemic circulation the general circulation, carrying oxygenated blood from the left ventricle to the body tissues, and returning venous blood to the right atrium. umbilical circulation fetal circulation through the umbilical vessels. vitelline circulation the circulation through the blood vessels of the yolk sac.
Definition of umbilical cord. 1a : a cord arising from the navel that connects the fetus with the placenta and through which respiratory gases, nutrients, and wastes passb : yolk stalk. 2 : a tethering or supply line (as for an astronaut outside a spacecraft or a diver underwater) 3 : a necessary, supportive, or nurturing link or connection.