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
mid 17th cent.: modern Latin, from Greek kōma 'deep sleep'; related to koitē 'bed' and keisthai 'lie down'
coma2 [ˈkəʊmə] (pl. comae -miː)
(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
early 17th cent. (as a botanical term): via Latin from Greek komē 'hair of the head'