Definition of grand mal noun from the Oxford Advanced American Dictionary

 

grand mal

 noun
noun
NAmE//ˌɡrɑn ˈmɑl//
 
, NAmE//ˌɡrænˈmɑl//
 
[uncountable](from French)(medical)
 
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a serious form of epilepsy in which someone becomes unconscious for fairly long periods compare petit mal
See the Oxford Advanced Learner's Dictionary entry: grand mal