- a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person.
Origin of coma1
- Astronomy. the nebulous envelope around the nucleus of a comet.
- 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.
- a tuft of silky hairs at the end of a seed.
- the leafy crown of a tree; cluster of leaves at the end of a stem.
- a terminal cluster of bracts, as in the pineapple.
Origin of coma2
Examples from the Web for coma
The peace process is in a coma; and ISIS, Hamas, Assad, Hezbollah, and the Iranian mullahs make Israel look like the good guys.The Inside Story of U.S. Meddling in Israel’s Elections
Aaron David Miller
December 4, 2014
Everything changes when Rick slips into a coma after being shot while pursuing a criminal.
For Rick, who awakens from his coma months after the dead have risen, the world changes overnight.
While he was in a coma for seven days, his consciousness entered a series of transcendent realms.Eben Alexander Has a GPS for Heaven
October 8, 2014
Nine months later, he awakens from his coma with washboard abs and the ability to run really fast.‘The Flash’ Review: Teen Angst Gets a Comic Book Quickie
October 7, 2014
It was the end; coma was coming; the mind was departing with the breath.The Three Cities Trilogy, Complete
It was not long before they were reduced to a coma of hunger.White Fang
They sprinkled him with ginger, but it took a long time before he woke from his coma.The Chinese Fairy Book
In a condition almost of coma, he had no measure or count of the hours that passed.Two Thousand Miles Below
Charles Willard Diffin
It was the coma of my whole being, as if a thunderbolt had struck me.
- 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
- 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
- a tuft of hairs attached to the seed coat of some seeds
- the terminal crown of leaves of palms and moss stems
- optics a type of lens defect characterized by the formation of a diffuse pear-shaped image from a point object
Word Origin and History for coma
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).
- A state of profound unconsciousness in which an individual is incapable of sensing or responding to external stimuli.
- 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.
- Astronomy The brightly shining cloud of gas that encircles the nucleus and makes up the major portion of the head of a comet near the Sun. As a comet moves along its orbit away from the Sun, the gas and dust of the coma dissipate, leaving only the nucleus. A coma can have a diameter of up to 100,000 km (62,000 mi.). See more at comet.
- Physics A diffuse, comet-shaped image of a point source of light or radiation caused by aberration in a lens or mirror. The image appears progressively elongated with distance from the center of the field of view.