A state in which patient is incapable of being aroused by external stimuli or inner needs.Can be characterized by absence of sleep/wake cycles and loss of response to even vigorous stimulation. Compare to " locked-in state" in which there is little or no disturbance of awareness (consciousness) but only an inability of the patient to respond to stimuli.

Abnormal deep sleep or stupor resulting from an illness or injury.

A sleep-like state; not conscious. May be due to a high or low level of glucose (sugar) in the blood. See also: Diabetic coma.

final stage of brain failure; it is characterized by total unresponsiveness to all external stimuli

A emergency in which a person is not conscious; may occur in people with diabetes because his or her blood glucose (sugar) is too high or too low.

Deep unconsciousness. To make the definition more precise, Jennett & Teasdale have offered the definition: "not obeying commands, not uttering words, and not opening the eyes." This is now generally used. In the GLASGOW COMA SCALE (GCS) (qv) scores range from 3 (least responsive) to 15 (most responsive). No point absolutely discriminates patients in coma from those not in coma. However, 90% of observations totalling 8 or less were within the definition of coma and none of those whose scores totalled 9 or more; so that 8/9 is usually taken as the dividing line in terms of GCS.

state of profound unconsciousness in which an individual is incapable of sensing or responding to the external environment

a complete lack of consciousness, characterised by loss of reaction to external stimuli and the absence of spontaneous nervous activity and usually associated with injury to the cerebrum. Unconsciousness may accompany a number of metabolic disorders or physical injuries to the brain from disease or trauma.

A state of prolonged unconsciousness in which a person cannot respond to spoken commands or mildly painful physical stimuli.

extended loss of consciousness due to an injury, illness, or poison.

a state of deep and often prolonged unconsciousness; usually the result of disease or injury

a continued unconscious state that can occur as part of the natural recovery for a person who has experienced a severe brain injury

a deep state of unconsciousness, during which an individual is not able to react to their environment

a deep state of unconsciousness from which it is impossible to be aroused

a modification of consciousness at a level which varies according to the severity and where the neurovegetative functions are more or less preserved

an abnormal state of deep unconsciousness from which a person can't be roused

an unarousable, sleep-like conditions resulting from injury to the brain stem

a potentially long-term condition in which affected individuals are completely unconscious with no voluntary movements

a profound state of unconciousness where the sleep wake cycle does not apply

a profound state of unconsciousness

a state of deep unconsciousness from which a person cannot be aroused

a state of depressed level of consciousness and should be distinguished from the abnormal content of consciousness that results in confusion, delirium, or psychosis

a state of unconsciousness in which the person does not respond to environmental stimuli

state of unconsciousness, cat doesn't wake up when it hears the owners voice

A sleep-like state in which a person or animal is not conscious. May be caused by Hyperglycaemia (high blood glucose) or hypoglycemia (low blood glucose) in diabetics.

A decreased state of consciousness from which a person cannot be roused.

a state of being unresponsive

Deep, depressed consciousness to the degree of unresponsiveness to painful stimulation.

This is a deep, sustained unconsciousness that results from the brain damage. The eyes remain closed and the patient cannot be aroused.

A state of unconsciousness from which the patient cannot be awakened or aroused, even by powerful stimulation; lack of any response to one's environment. Defined clinically as an inability to follow a one-step command consistently; Glasgow Coma Scale score of 8 or less.

An abnormal state of depressed responsiveness with absence of response to stimuli.

Unconsciousness of significant but usually undetermined length.

A state of profound unconsciousness from which one cannot be roused.

A state of deep unconsciousness due to accidents or illness.

The state of unconsciousness in which patients lie unresponsive with the eyes closed.

A state of reduced consciousness in which the brain no longer functions properly.

A deep, prolonged state of unconsciousness.

A state of unconsciousness wherein the person is incapable of responding to internal or external stimuli.

A state of drowsiness followed by loss of consciousness. May occur in liver failure.

A state of profound unconsciousness in which a person cannot open eyes, obey commands or speak words that can be understood.

loss of consciousness from any cause. In diabetes may result from either very high or very low blood glucose levels

A condition in which the area of the brain involved in maintaining consciousness is somehow affected, resulting in a state of unconsciousness in which the patient does not respond to stimulation.

A state of profound unconsciousness. In persons with diabetes, coma may result from hypoglycemia or hyperglycemia.

Total unawareness of self and environment with no periods of awakening; could be deep with total lack of response or less deep when some reflex response could be evoked with stimulation.

a period of impaired consciousness in which the person does not follow commands, has difficulty maintaining arousal, and shows minimal or no awareness of the environment and interaction with others; the duration of coma is often used as a prognostic indicator of eventual recovery

A state of deep, often prolonged unconsciousness, usually the result of injury, disease, or poison, in which an individual is incapable of sensing or responding to external stimuli and internal needs. Reference: A1

A sometimes dangerous and potentially fatal unconsciousness, a coma is the direct result of the interaction with the Gloom. This condition is frequently described by newly initiated or potential Others, occurring when the Gloom is allowed to drain too much energy from an Other. Initiates must be trained to limit their exposure to the Gloom's powers to prevent these comas. Victims take on a lifeless, ashen appearance. Expedient and direct contact with another life force can revive a victim, though not without considerable risk to the rescuer.

is a state of unconsciousness. In diabetes, it may result from a variety of causes including severe hypoglycemia or severe ketoacidosis.

A state of altered consciousness, sharing some characteristics with sleep, but not usually arousable from, unlike sleep.

a state of profound unconsciousness caused by disease, injury, or poison.

unconsciousness that cannot be roused.

State of deep unconsciousness caused by disease or injury.

unconsciousness beyond arousal.

A sleep-like state in which a person is not conscious. May be caused by hyperglycemia (high blood glucose) or hypoglycemia (low blood glucose) in people with diabetes.

A deep, sleep-like state.  Persons in this state cannot be awakened.

State of unconsciousness where the person is unresponsive to their surroundings.

An unconscious state from which an individual cannot be aroused, even by strong stimuli.

a state of unconsciousness and unresponsiveness that results from disturbance or damage to areas of the brain.

A state of unconsciousness from which the patient cannot be aroused, even by powerful stimulation. Coma involves the loss of awareness of self and the surrounding environment.

A prolonged unconsciousness caused by disease, injury, or poison. A person in a state of coma cannot be roused, even by painful stimuli.

a state of deep unconciousness in which a person does not respond to any external stimuli Humans as organisms

A coma is a sleep like state when someone is unconscious for a long period of time.

A deep, prolonged and sometimes irreversible unconsciousness from which the patient cannot be awakened.

A state where someone is deeply unconscious search for Coma

A state of unarousable unconsciousness.

A roughly spherical region of diffuse gas which surrounds the nucleus of a comet. Together, the coma and the nucleus form the comet's head.

The diffuse gaseous component of the head of a comet; i.e, the cloud of evaporated gas around a comet nucleus.

A lens defect which results in points of light appearing in the image not as points but as discs with comet-like tails.

Aberration (distortion) resembling little commas, near the edges of the field of view. Common in fast f/ratio telescopes, or in telescope that are out of collimation.

A defect causing stars to be deformed into a fanlike or comet shape. This is typically caused by misaligned optics.

A lens aberration restricted to off axis image points; the inability of a lens to render point sources of light near the edges of the frame as circular; the points of light appear as comet-shaped blurs (hence the name coma) with the tails flaring toward the center of the image; this aberration is very difficult to eliminate in wideangle lenses with large maximum apertures; improves by stopping down the lens.

The extended, glowing region that surrounds the nucleus of a comet.

This refers to the blurring of objects at the edge of the field of view, most common in short focal ratio Newtonian telescopes (at f/10 and longer, Newtonians are very well corrected for coma).

Light rays, which beam from an object point aside the optical axis and which are also bundled aside the optical axis. The image of a point is biassed and has a tail similar to that of a comet.

A cloud of dust and gas which comes off of a comet as it nears and is heated by the sun. Referenced in: StarDust Your Meteor Your Meteor

Roughly spherical area of vaporizing gases and dust around the nucleus of a comet.

The region around the head of a comet.

(of a comet) gaseous envelope immediately surrounding the nucleus of a comet.

(comet): large atmosphere around a comet's nucleus that forms when the nucleus nears the Sun and warms up (usually at around Saturn's or Uranus' distance from the Sun).

A diffuse, luminous cloud of dust and gas that develops around a comet's nucleus as it nears the sun.

a small comet

A term for a specific optical distortion found in lenses. Refers to a blurry, pear shaped image of points of light (as in a bright reflection).

(i) The matter surrounding the nucleus of a comet – it results from the evaporation of the nucleus. (ii) An optical aberration in which stellar images are fan-shaped, similar to comets.

distortion towards the edge of the image caused by light approaching the lens at an oblique angle.

Cometary head generated by a roughly spherical outflow of gas and dust from a comet nucleus.

Imperfect optical system can make a star appear like a comet, with a “tail”.  This aberration can be reduced by stopping down the lens.

Coma is an aberration seen in certain telescope designs. It is an off-axis aberration, meaning it is not seen in the center of the field but grows progressively worse toward the edge of the field. Newtonians and commercial Schmidt-Cassegrain telescopes suffer from coma, although it is most noticeable in Newtonian scopes. Coma correctors can be used to eliminate this aberration. Achromatic refractors also tend to suffer from some coma, although apochromatic refractors usually eliminate or minimize the aberration. Ritchey-Chretien designs are specifically made to eliminate coma.

is a cloud of gas and dust surrounding the solid nucleus of the comet. The coma forms as the comet nears the Sun.

A cloud of gas and dust particles forming an atmosphere around a comet. The coma appears as a diffuse sometimes yellowish glow.

A defect of optical mirrors. The imperfect figure of a mirror causes light reflected from the center to come to focus at a different point than light reflected outside the center of the mirror. Coma produces fuzzy and elongated star images outside the center of the field of view and is inversely proportional to the focal ratio of an optical system. Therefore, the faster the mirror the greater the coma.

An asymmetrical off-axis aberration inherent in certain telescope designs.

The cloud of diffuse material surrounding the nucleus of a comet.

(1) The dust and gas surrounding the nucleus of a comet. (2) A defect in an optical system which gives rise to a blurred, pear shaped, comet-like image.

A spherical cloud of material surrounding the head of a comet. This material is mostly gas that the Sun has caused to boil off the comet's icy nucleus. This gas shines both by reflected sunlight and light emitted by excited molecules. A cometary coma can extend up to a million miles from the nucleus.

A higher order aberration which makes items appear to have a comet-shaped ”tail”, creating blurring in your vision.

The bright "head" of the comet, made up of dust and gas from the icy nucleus of the comet.

head of comet formed by sublimation from nucleus.

An area of dust or gas surrounding the nucleus of a comet.

A hazy cloud which surrounds the nucleus of a comet.

The gas cloud that surrounds the nucleus of a comet.

in astronomy, the head of a comet containing the nucleus and vaporized water

the image of a point source of light cannot be brought into focus, but has instead a comet shape

A coma is the roughly spherical blob of gas that surrounds the nucleus of a comet. The coma is comprised of water vapor, carbon dioxide gas, and other neutral gases that have sublimed from the solid nucleus. The coma and the nucleus form the head of a comet. A Few Comets Discovered Last Visit Next Visit Period (years) Halley 240 B.C. 1986 2061 76.00 Encke 1786 1997 2000 3.28 Biela 1772 1852 broken up 6.62 Faye 1843 1991 1999 7.34

third order aberration – this abnormality is characterized by an asymmetric up and down undulation from one side of the wave to the other. It is not uncommon to have a significant amount of coma in pre-operative refractive errors, especially among hyperopes. Off-centered ablations can feature large amounts of coma post-operatively.

The luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed.

The dust and gas surrounding an active comet's nucleus.

An aberration where light rays pass through an off-axis point causing the lens to focus at different points causing blur.

lens aberration producing asymmetrical distortion of points in the image.

There are several astronomical meanings. It can be used to describe the hazy looking patch that surrounds the nucleus of a comet or the blurred effect surrounding the images of stars on a photographic plate, or in the observers field of view in a telescope (or binoculars) due to defects in the lenses.

In astronomy, the nebulous envelope around the nucleus of a comet is called its coma (from the Latin word for "hair"). It is formed when the comet passes close to the sun on its highly elliptical orbit; as the comet warms, parts of it melt and/or vaporize. The coma is generally made of ice and dust.

In optics (especially telescopes), the coma (aka comatic aberration) in an optical system refers to aberration inherent to certain optical designs or due to imperfection in the lens or other components which results in off-axis point sources such as stars appearing distorted. Specifically, coma is defined as a variation in magnification over the entrance pupil. In refractive or diffractive optical systems, especially those imaging a wide spectral range, coma can be a function of wavelength.

a usually terminal tuft of hairs especially on a seed

a tuft, especially of hairs on a seed. adj. comose.

a punctuation mark