Definitions for "Grand mal"
A type of severe epilepsy seizure characterized by a loss of consciousness and convulsions. It is also called a tonic-clonic seizure, indicating that the seizure alternates between strong continuous muscle spasms (tonic) and rhythmic muscle contraction and relaxation (clonic).
a type of seizure occurring with epilepsy, producing loss of consciousness and involuntary jerking movements
generalized seizure accompanied by a loss of consciousness.