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.
plural umbilical cords. Learner's definition of UMBILICAL CORD. [count] : a long, narrow tube that connects an unborn baby to the placenta of its mother â sometimes used figuratively. The time has come to cut/sever the umbilical cord that keeps us dependent on foreign aid.