1690s, "state of unconsciousness caused by a narcotic," Modern Latin, from Greek narkosis, from narkoun "to benumb" (see narcotic (n.)).
narcosis nar·co·sis (när-kō'sĭs)
n. pl. nar·co·ses (-sēz)
General and nonspecific reversible depression of neuronal excitability, produced by a physical or chemical agent, usually resulting in stupor rather than in anesthesia.