critical

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critical

1. Informal so seriously injured or ill as to be in danger of dying
2. Physics of, denoting, or concerned with a state in which the properties of a system undergo an abrupt change
3. go critical (of a nuclear power station or reactor) to reach a state in which a nuclear-fission chain reaction becomes self-sustaining

critical

[′krid·ə·kəl]
(nucleonics)
Capable of sustaining a chain reaction at a constant level.

critical

Essential for continued operations. In risk analysis, one classifies data by the degree of sensitivity and criticality. See sensitive and risk assessment.
References in classic literature ?
In her bedroom Saxon completed her dressing, for an instant stepping upon a chair so as to glimpse critically in the small wall-mirror the hang of her ready-made linen skirt.
He turned his head towards her and regarded her critically, as though making some test of her sincerity.
Jammu -- 21 people died and at least 30 others were injured, six of them critically, when a bus they were travelling in rolled down into a deep gorge in Udhampur district of occupied Jammu and Kashmir on Monday.
Food and Drug Administration cleared a new indication for the Nova StatStrip Glucose Hospital Meter System, extending its use to critically ill patients who have been hospitalized.
An article published in the Journal of Critical Care revealed lower levels of coenzyme Q10 (CoQ10) in critically ill patients in comparison with healthy men and women.
THE SPECIES MOST RELIANT ON ZOOS FOR SURVIVAL Mountain chicken frog, from Dominica and Monserrat, critically endangered; White-clawed crayfish, from countries including Britain, endangered; Blue-crowned laughing thrush, from China, critically endangered; Amur leopard, from China, Russia and Korea, critically endangered; Potosi pupfish, from Mexico, extinct in the wild; Polynesian tree snail; from French Polynesia, extinct in the wild; Verdcourt's polyalthia tree, from Tanzania, endangered; Blue-eyed black lemur, from Madagascar, critically endangered; Ploughshare tortoise, from Madagascar, critically endangered; Scimitar-horned oryx, from Tunisia, Morocco and Senegal, extinct in the wild.
WASHINGTON, June 14 /PRNewswire-USNewswire/ -- Patients with Medicare or Medicaid, the uninsured, the elderly and the critically ill are the heaviest users of ambulances for transport to the emergency department, making them most vulnerable during periods of ambulance diversion.
The study goes against the World Health Organization (WHO) guidelines, which say all critically ill patients should be treated with Tamiflu and if the patient was unresponsive to standard doses, or critically ill, a higher dose should be considered.
Conducted between late March and late August, the studies, reported online October 12 in the Journal of the American Medical Association, find that the most critically ill patients suffer from oxygen deprivation in the blood, a dangerous condition that can lead to shock, organ failure and death.
Critically evaluate the needs of the package insert and marketing application up front, before getting deeply into clinical trials.
1 -- color) John Grant holds a photo of himself, his children and his wife, Carol, who was critically injured in a car crash on April 17.
Food and Drug Administration (FDA) has approvced Tagamet(R) (cimetidine), administered 50 mg/hour (1200 mg/day) by continuous intravenous infusion, for the prevention of upper gastrointestinal (GI) bleeding in critically ill hospitalized patients, SmithKline Beecham announced today.