Noun
clinical death (countable and uncountable, plural clinical deaths)
(medicine, law) A state in which usual medically observable vital signs—such as respiration, heartbeat, and corneal reflex—are not present, but from which patients are sometimes revived.
A patient with working heart and lungs determined to be brain dead can be pronounced legally dead without clinical death occurring. Source: Internet
He applied the same argument to the process of dying itself, saying that the early stages of clinical death may be reversible in the future. Source: Internet