| 单词 | coma |
| 释义 | Word Frequency coma 1(ˈkəʊmə) nounWord forms: 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 C17: from medical Latin, from Greek kōma heavy sleep; related to Greek koitē bed, perhaps to Middle Irish cuma griefWord Frequency coma 2(ˈkəʊmə) nounWord forms: plural -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 a. a tuft of hairs attached to the seed coat of some seeds b. the terminal crown of leaves of palms and moss stems 3. optics a type of lens defect characterized by the formation of a diffuse pear-shaped image from a point object Derived forms comal (ˈcomal) adjective Word origin C17: from Latin: hair of the head, from Greek komē |
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