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coma    音标拼音: [k'omə]
n. 昏迷,麻木,慧发

昏迷,麻木,慧发

coma
n 1: a state of deep and often prolonged unconsciousness;
usually the result of disease or injury [synonym: {coma},
{comatoseness}]
2: (botany) a usually terminal tuft of bracts (as in the
pineapple) or tuft of hairs (especially on certain seeds)
3: (astronomy) the luminous cloud of particles surrounding the
frozen nucleus of a comet; forms as the comet approaches the
sun and is warmed

Coma \Co"ma\ (k[=o]"m[.a]), n. [NL., fr. Gr. kw^ma lethargy, fr.
koima^n to put to sleep. See {Cemetery}.]
A state of profound insensibility from which it is difficult
or impossible to rouse a person. See {Carus}.
[1913 Webster]


Coma \Co"ma\, n. [L., hair, fr. Gr. ko`mh.]
1. (Astron.) The envelope of a comet; a nebulous covering,
which surrounds the nucleus or body of a comet.
[1913 Webster]

2. (Bot.) A tuft or bunch, -- as the assemblage of branches
forming the head of a tree; or a cluster of bracts when
empty and terminating the inflorescence of a plant; or a
tuft of long hairs on certain seeds.
[1913 Webster]

{Coma Berenices}[L.] (Astron.), a small constellation north
of Virgo; -- called also {Berenice's Hair}.
[1913 Webster]


Envelope \En"vel*ope\ (?; 277), Envelop \En*vel"op\ (?; 277), n.
[F. enveloppe.]
1. That which envelops, wraps up, encases, or surrounds; a
wrapper; an inclosing cover; esp., the cover or wrapper of
a document, as of a letter.
[1913 Webster]

2. (Astron.) The nebulous covering of the head or nucleus of
a comet; -- called also {coma}.
[1913 Webster]

3. (Fort.) A work of earth, in the form of a single parapet
or of a small rampart. It is sometimes raised in the ditch
and sometimes beyond it. --Wilhelm.
[1913 Webster]

4. (Geom.) A curve or surface which is tangent to each member
of a system of curves or surfaces, the form and position
of the members of the system being allowed to vary
according to some continuous law. Thus, any curve is the
envelope of its tangents.

4. A set of limits for the performance capabilities of some
type of machine, originally used to refer to aircraft; --
it is often described graphically as a two-dimensional
graph of a function showing the maximum of one performance
variable as a function of another. Now it is also used
metaphorically to refer to capabilities of any system in
general, including human organizations, esp. in the phrase
push the envelope. It is used to refer to the maximum
performance available at the current state of the
technology, and therefore refers to a class of machines in
general, not a specific machine.
[PJC]

{push the envelope} to increase the capability of some type
of machine or system; -- usually by technological
development.
[1913 Webster]

46 Moby Thesaurus words for "coma":
KO, blackout, catalepsy, catatonia, catatony, dullness,
encephalitis lethargica, faint, grayout, hebetude, high, kayo,
knockout, languor, lassitude, lethargy, lipothymia, lipothymy,
narcohypnosis, narcolepsy, narcoma, narcosis, narcotic stupor,
narcotization, nirvana, nirvana principle, nod, nothingness,
oblivion, obliviousness, sedation, semiconsciousness,
senselessness, shock, sleep, sleeping sickness, slumber, sopor,
stupor, swoon, syncope, thanatosis, torpidity, torpor, trance,
unconsciousness


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  • Coma - Wikipedia
    A coma is a deep state of prolonged unconsciousness in which a person cannot be awakened, fails to respond normally to painful stimuli, light, or sound, lacks a normal sleep-wake cycle and does not initiate voluntary actions [1]
  • Coma - Symptoms and causes - Mayo Clinic
    Coma is a state of prolonged loss of consciousness It can have a variety of causes, including traumatic head injury, stroke, brain tumor, or drug or alcohol intoxication A coma may even be caused by an underlying illness, such as diabetes or an infection
  • Coma: Types, Causes, Treatments, Prognosis - WebMD
    During a coma, a person is unresponsive to their environment The person is alive and looks like they are sleeping However, unlike in a deep sleep, the person cannot be awakened by any
  • Coma: Symptoms, Treatment, and Outlook
    A coma is a type of deep unconsciousness causing a lack of awareness, response, or movement Comas can be caused by brain damage due to many different conditions, such as severe cases of low blood sugar, head injury, and infection The outlook of a coma can depend on the person, coma cause, and coma severity Recovery is possible for some people
  • Coma: What It Is, Causes, Diagnosis, Symptoms Treatment
    A coma is a medical emergency If you’re with someone who’s unconscious and unresponsive, call 911 (or your local emergency services number) immediately Many causes of coma need immediate medical care, and any delay could lead to dangerous complications or death How common are comas?
  • Coma: Causes, diagnosis, treatment, and outlook - Medical News Today
    A coma is a deep state of unconsciousness that can result from an injury or illness In some cases, it lasts for just a few days, but in others, the person does not wake up
  • Coma - MedlinePlus
    A coma is a deep state of unconsciousness An individual in a coma is alive but unable to move or respond to his or her environment Coma may occur as a complication of an underlying illness, or as a result of injuries, such as brain injury A coma rarely lasts more than 2 to 4 weeks
  • Coma: Types, Causes, Treatments, Prognosis, and More - Healthline
    A coma is a prolonged state of unconsciousness that occurs when a part of the brain is damaged, either temporarily or permanently Learn about treatments and prognosis





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