Definition of coma noun from the Oxford Advanced Learner's Dictionary

 

coma

 noun
noun
BrE BrE//ˈkəʊmə//
 
; NAmE NAmE//ˈkoʊmə//
 
Injuries
 
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a deep unconscious state, usually lasting a long time and caused by serious illness or injury to go into/be in a coma See related entries: Injuries Word Origin mid 17th cent.: modern Latin, from Greek kōma ‘deep sleep’; related to koitē ‘bed’ and keisthai ‘lie down’.Extra examples He fell into a coma after suffering a stroke. He has been in a coma since his car accident three months ago. He has been in a coma since the accident. He sank into a coma after suffering a brain haemorrhage.
See the Oxford Advanced American Dictionary entry: coma