coma

coma1
[ˈkəʊmə]
noun
  1. a state of deep unconsciousness that lasts for a prolonged or indefinite period, caused especially by severe injury or illness
    昏迷
    she went into a coma.
    一次公路上的碰撞事故使他昏了过去。
    ■(humorous)a state of extreme exhaustion, lethargy, or sleepiness
    (幽默)疲惫;无精打采,懒散;昏昏欲睡
语源
  1. mid 17th cent.: modern Latin, from Greek kōma 'deep sleep'; related to koitē 'bed' and keisthai 'lie down'

coma2
[ˈkəʊmə]
(pl. comae -miː)
  1. (Astronomy)a diffuse cloud of gas and dust surrounding the nucleus of a comet
    (天文)彗发
    ■[mass noun](Optics)aberration which causes the image of an off-axis point to be flared like a comet
    (光学)彗形像差
语源
  1. early 17th cent. (as a botanical term): via Latin from Greek komē 'hair of the head'
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