Coma

[koh-muh] /ˈkoʊ mə/

noun, plural comas.
1.
a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person.
[koh-muh] /ˈkoʊ mə/
noun, plural comae
[koh-mee] /ˈkoʊ mi/ (Show IPA)
1.
Astronomy. the nebulous envelope around the nucleus of a comet.
2.
Optics. a monochromatic aberration of a lens or other optical system in which the image from a point source cannot be brought into focus, the image of a point having the shape of a comet.
3.
Botany.

/ˈkəʊmə/
noun (pl) -mas
1.
a state of unconsciousness from which a person cannot be aroused, caused by injury to the head, rupture of cerebral blood vessels, narcotics, poisons, etc
/ˈkəʊmə/
noun (pl) -mae (-miː)
1.
(astronomy) the luminous cloud surrounding the frozen solid nucleus in the head of a comet, formed by vaporization of part of the nucleus when the comet is close to the sun
2.
(botany)

3.
(optics) a type of lens defect characterized by the formation of a diffuse pear-shaped image from a point object
n.

state of prolonged unconsciousness, 1640s, from Latinized form of Greek koma (genitive komatos) “deep sleep,” of uncertain origin.

“head of a comet,” 1765, from Latin coma, from Greek kome “hair of the head,” of unknown origin. Earlier in English as a botanical term for a tuft of hairs (1660s).

coma co·ma (kō’mə)
n.
A state of profound unconsciousness in which an individual is incapable of sensing or responding to external stimuli.
coma 1
(kō’mə)
Plural comas
A state of deep unconsciousness, usually resulting from brain trauma or metabolic disease, in which an individual is incapable of sensing or responding to external stimuli.
coma 2
(kō’mə)
Plural comae (kō’mē)

coma [(koh-muh)]

An abnormal state of deep unconsciousness. A coma may occur as the result of trauma to the head, disease (such as meningitis, stroke, or diabetes mellitus), or poisoning.