what is life support
Definition of Life support. Life support: 1. A therapy or device designed to preserve someone's life when an essential bodily system is not doing so. Life support may, for example, involve enteric feeding (by a tube), total parenteral nutrition, mechanical ventilation, a pacemaker, defibrillator, heart/lung machine, or dialysis. 2. Something that sustains life, as in The earth is the ultimate life support system.. 3.