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Medical Dictionary for the Health Professions and Nursing (2012) defines 'death' as: The irreversible cessation of life. In lower multicellular organisms, death is a gradual process at the cellular level, because tissues vary in their ability to withstand deprivation of oxygen; in higher organisms, a cessation of vital tissue and organ functions; in humans, manifested by the loss of heartbeat (i.e., asystole), absence of spontaneous breathing, and cessation of the brain's electrical activity.
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Collins Dictionary of Medicine (2004 and 2005) defines 'death' as: The cessation of the processes of living. This may occur at cellular level, at tissue level or at the level of the entire organism (somatic death). Death of the whole organism results from failure of the supply of essential fuels, especially oxygen and sugar, or from inability of the tissues to use them, because of poisoning or other damage.
Collins Dictionary of Biology (3rd Edition) defines 'death' as: The end of the state which enables living matter to acquire energy from the environment; the termination of the collective activities of an organism.
Saunders Comprehensive Veterinary Dictionary (3rd Edition, 2007) defines 'death' as: The cessation of all physical and chemical processes that invariably occurs in all living organisms. Even in humans there is at present no standardized diagnosis of clinical death. The existing procedure, and the one recommended for use in animals, is to declare the animal dead when brain death has occurred. Brain death has occurred when the animal is in a deep irreversible coma.
The Merriam-Webster Dictionary defines 'death' as: A permanent cessation of all vital functions: the end of life. The irreversible cessation of all vital functions especially as indicated by permanent stoppage of the heart, respiration, and brain activity: the end of life.
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