Coma

n. state of being unconscious for an extended period of time

n. terminal tuft of hairs on a seed (Botany); cloudy covering around the nucleus of a comet (Astronomy)

In medicine, a coma (from the Greek  koma, meaning deep sleep) is a profound state of unconsciousness. A comatose patient cannot be awakened, fails to respond normally to pain or light, does not have sleep-wake cycles, and does not take voluntary actions. Coma may result from a variety of conditions, including intoxication, metabolic abnormalities, central nervous system diseases, acute neurologic injuries such as stroke, and hypoxia. It may also be deliberately induced by pharmaceutical agents in order to preserve higher brain function following another form of brain trauma.
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Coma may refer to: In science:Coma, in medicine, a profound state of unconsciousnessComa (cometary), part of the tail of a comet, produced by vapor boiled off the comet as it nears the sunComa Berenices, a constellationComa Cluster, a colllection of more than a thousand galaxies, some 300 million light-years away. Coma (optics), an optical aberration in an astronomical telescope which causes a V-shaped flare to the image of a starCache only memory architecture, in computer scienceCouncil on Mind Abuse, a Toronto, Canada based non-profit organization which promoted cult education
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Coma, from the Greek word "koma," meaning deep sleep, is a state of extreme unresponsiveness, in which an individual [more]Coma - Community and Resources

Noun
1. a state of deep and often prolonged unconsciousness; usually the result of disease or injury
(synonym) comatoseness
(hypernym) unconsciousness
(hyponym) diabetic coma, Kussmaul's coma
2. a usually terminal tuft of hairs especially on a seed
(hypernym) hair, fuzz, tomentum
3. (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
(hypernym) cloud
(part-holonym) comet
(classification) astronomy, uranology

n. coma, shock