coma

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

Coma

In medicine, a coma (from the Greek κῶμα koma, meaning `deep sleep`) is a state of unconsciousness lasting more than six hours 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. A person in a state of coma is describ.....
Found on http://en.wikipedia.org/wiki/Coma

Coma

unconsciousness. For a diabetic, coma can be caused by hypoglycemia or by diabetic ketoacidosis.
Found on http://en.wikipedia.org/wiki/Glossary_of_diabetes

coma

(from the article `comet`) The coma, which produces the nebulous appearance of the cometary head, is a short-lived, rarefied, and dusty atmosphere escaping from the nucleus. It ... ...orbits of Saturn and Uranus with a period of about 50.7 years. In 1989 two other Americans, Karen J. Meech and Michael Belton, detected a fuzzy ... ......
Found on http://www.britannica.com/eb/a-z/c/113

coma

(from the article `optics`) The 2 term in the OPD expression represents the aberration called coma, in which the image of a point has the appearance of a comet. The and ... Coma, so called because a point image is blurred into a comet shape, is produced when rays from an off-axis object point are imaged by different ... ...in diffe...
Found on http://www.britannica.com/eb/a-z/c/113

coma

(ko´mә) a state of unconsciousness from which the patient cannot be aroused, even by powerful stimuli. Traumatic brain injuries are the most frequent cause; other causes include severe uncontrolled diabetes mellitus, liver disease, kidney disease, and neurologic conditions. adj., co´matose., adj.
Found on http://www.encyclo.co.uk/local/21001

coma

[n] - a usually terminal tuft of hairs especially on a seed 2. [n] - (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet 3. [n] - a state of deep and often prolonged unconsciousness
Found on http://www.webdictionary.co.uk/definition.php?query=coma

Coma

• (n.) 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. • (n.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet. • (n.) A state of profound ...
Found on http://thinkexist.com/dictionary/meaning/coma/

coma

comatoseness noun a state of deep and often prolonged unconsciousness; usually the result of disease or injury
Found on https://www.encyclo.co.uk/local/20974

coma

(medicine) In medicine, a state of deep unconsciousness from which the subject cannot be roused. Possible causes include head injury, brain disease, liver failure, cerebral haemorrhage, and drug overdose
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0013527.html

Coma

[cometary] Coma is the nebulous envelope around the nucleus of a comet. It is formed when the comet passes close to the Sun on its highly elliptical orbit; as the comet warms, parts of it sublimate. This gives a comet a `fuzzy` appearance when viewed in telescopes and distinguishes it from stars. The word coma comes from the Greek `kome`, i...
Found on http://en.wikipedia.org/wiki/Coma_(cometary)

Coma

[optics] In optics (especially telescopes), the coma, or comatic aberration, in an optical system refers to aberration inherent to certain optical designs or due to imperfection in the lens or other components that results in off-axis point sources such as stars appearing distorted, appearing to have a tail (coma) like a comet. Specifically...
Found on http://en.wikipedia.org/wiki/Coma_(optics)

Coma

Co'ma (kō'mȧ) noun [ New Latin , from Greek kw^ma lethargy, from 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 .
Found on http://www.encyclo.co.uk/webster/C/113

Coma

Co'ma noun [ Latin , hair, from Greek ko`mh .] 1. (Astron.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet. 2. (Botany) A tuft or bunch, -- as the assemblage of branches forming the head of a tree; or a cluster...
Found on http://www.encyclo.co.uk/webster/C/113

Coma

A coma is a sleep like state when someone is unconscious for a long period of time.
Found on http://www.nhs.uk/Conditions/Pages/hub.xhtml

Coma

A coma is a state of deep unconsciousness.
Found on http://www.probertencyclopaedia.com/browse/EC.HTM

coma

A condition in which a patient is in a state of deep sleep and cannot be awakened. A coma may be caused by many things, including trauma, drugs, toxins, or certain diseases.
Found on http://www.cancer.gov/dictionary?expand=C

Coma

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
Found on http://www.medichecks.com/glossary.cfm?ltr=C

coma

A deep prolonged unconsciousness where the patient cannot be aroused. This is usually as the result of a head injury, neurological disease, acute hydrocephaly, intoxication or metabolic derangement. ... (27 Sep 1997) ...
Found on http://www.encyclo.co.uk/local/20973

coma

A glowing envelope of gas and dust that surrounds a comet`s nucleus when the comet comes within a few astronomical units of the Sun (although Chiron has been seen to develop a coma at 11 AU). At perihelion, the coma is typically about 100,000 km across, and shaped into a teardrop by the solar wind. ...
Found on http://www.daviddarling.info/encyclopedia/C/coma.html

Coma

A lens aberration or defect that causes rays that passes obliquely through the lens to be focused at different points on the film plane.
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

Coma

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...
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

Coma

A lens defect which results in points of light appearing in the image not as points but as discs with comet-like tails.
Found on http://www.peterashbyhayter.co.uk/glossaryT-Z.html

Coma

A period of profound and prolonged unconsciousness following disease or injury.
Found on http://www.encyclo.co.uk/local/20437

Coma

A ring or tuft of fine hairs on a seed, functional in wind dispersal.
Found on http://www.encyclo.co.uk/local/22034
No exact match found