| 单词 | coma |
| 释义 | coma coma1 /koh"meuh/, n. , pl. comas. a state of prolonged unconsciousness, including a lack of response to stimuli, from which it is impossible to rouse a person. [1640-50; < Gk kôma deep sleep] coma2 /koh"meuh/, n. , pl. comae /-mee/. 1. Astron. 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. Bot. a. a tuft of silky hairs at the end of a seed. b. the leafy crown of a tree; cluster of leaves at the end of a stem. c. a terminal cluster of bracts, as in the pineapple. [1660-70; < L: hair < Gk kóme] |
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