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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
    Coma A coma (from Ancient Greek κῶμα koma 'deep sleep'[1][2]) is a prolonged state of deep unconsciousness in which a person cannot be awakened, fails to respond normally to stimuli (including pain, light, and sound), lacks a normal sleep-wake cycle and does not initiate voluntary actions [3]
  • Coma: What It Is, Causes, Signs Treatment - Cleveland Clinic
    A coma is a deep unconscious state where you can’t wake up or respond, even to pain or loud sounds Head injuries, strokes, infections or overdoses, among other things, can cause it
  • 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
  • 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: Types, Causes, Treatment, Recovery, and Outlook
    A coma is a state of deep unconsciousness in which a person is unresponsive for a prolonged time Although comas have many possible causes, they all involve temporary or permanent harm to the brain, impairing a person’s awareness of their surroundings and their ability to respond to them
  • 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
  • Overview of Coma and Impaired Consciousness - MSD Manuals
    Coma is unresponsiveness from which the patient cannot be aroused and in which the patient's eyes remain closed Impaired consciousness refers to similar, less severe disturbances of consciousness; these disturbances are not considered coma
  • Coma: Symptoms, Treatment, and Outlook
    A coma is a state of unconsciousness A coma can happen due to brain injury, lack of oxygen, or complications from conditions like diabetes and infection Sometimes, doctors deliberately put a person into a coma to keep them comfortable during treatment A coma is similar to a very deep sleep
  • Coma Signs, Types, Causes, Prevention Treatment
    What Is the Medical Definition of Coma? A coma is a deep state of unconsciousness in which individuals do not consciously respond to stimuli in their environment What Can Cause a Coma? Coma can result from an injury such as head trauma, an underlying illness such as an infection or tumor, or toxins that enter the body





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