a state of deep unconsciousness that lasts for a prolonged or indefinite period, caused especially by severe injury or illness
昏迷
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a road crash left him in a coma .一次公路上的碰撞事故使他昏了过去。
〈幽默〉 疲惫;无精打采,懒散;昏昏欲睡。
【天文】 彗发。
[mass noun]
【光学】 彗形像差。
"mid 17th cent.: modern Latin, from Greek