| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024co•ma1 /ˈkoʊmə/USA pronunciation n. [countable], pl. -mas. - Pathologya state of deep unconsciousness, often caused by a serious head injury:in a coma that lasted for months.
WordReference Random House Unabridged Dictionary of American English © 2024co•ma1 (kō′mə),USA pronunciation n., pl. -mas. - a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person.
- Greek kôma deep sleep
- 1640–50
- Astronomythe nebulous envelope around the nucleus of a comet.
- Opticsa 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.
- [Bot.]
- Botanya tuft of silky hairs at the end of a seed.
- Botanythe leafy crown of a tree;
cluster of leaves at the end of a stem. - Botanya terminal cluster of bracts, as in the pineapple.
- Greek kómē
- Latin: hair
- 1660–70
Collins Concise English Dictionary © HarperCollins Publishers:: coma /ˈkəʊmə/ n ( pl -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
Etymology: 17th Century: from medical Latin, from Greek kōma heavy sleep; related to Greek koitē bed, perhaps to Middle Irish cuma grief coma /ˈkəʊmə/ n ( pl -mae / -miː/)- 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
Etymology: 17th Century: from Latin: hair of the head, from Greek komē |