noun, plural co·mas. a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person. RELATED WORDS slumber
somnolence Origin of coma 1
First recorded in
1640–50, coma is from the Greek word kôma deep sleep noun, plural co·mae . [ koh-mee] /ˈkoʊ mi/ . 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. . Botany 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 coma 2 1660–70; < Latin: hair < Greek kómē
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for coma Contemporary Examples of coma
The peace process is in a
coma; and ISIS, Hamas, Assad, Hezbollah, and the Iranian mullahs make Israel look like the good guys.
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.
Nine months later, he awakens from his
coma with washboard abs and the ability to run really fast. Historical Examples of coma British Dictionary definitions for coma noun plural -mas 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 Word Origin for coma
C17: from medical Latin, from Greek
kōma heavy sleep; related to Greek koitē bed, perhaps to Middle Irish cuma grief noun plural -mae ( -miː) 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 botany 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 Derived Forms comal, adjective Word Origin for coma
C17: from Latin: hair of the head, from Greek
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for coma n.1
state of prolonged unconsciousness, 1640s, from Latinized form of Greek
koma (genitive komatos) "deep sleep," of uncertain origin. n.2
"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).
Online Etymology Dictionary, © 2010 Douglas Harper
Medicine definitions for coma n. A state of profound unconsciousness in which an individual is incapable of sensing or responding to external stimuli.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for coma 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. Plural comae ( kō) ′mē 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.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Culture definitions for coma
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.