grand mal

n.
A severe form of epilepsy characterized by seizures involving spasms and loss of consciousness.

[French : grand, great + mal, illness.]

(grănd' mäl', măl')
n.

A severe epilepsy characterized by seizures involving spasms and by the loss of consciousness. Also called generalized epilepsy, generalized tonic-clonic epilepsy, generalized tonic-clonic seizure, grand mal epilepsy, idiopathic epilepsy, major epilepsy.

[Fr.] a major seizure attended by loss of consciousness and convulsive movements, as distinguished from petit mal, a minor seizure. See also epilepsy, seizure.

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The noun has one meaning:

Meaning #1: a seizure (or a type of epilepsy characterized by such seizures) during which the patient becomes unconscious and has convulsions over the entire body
  Synonyms: generalized seizure, epilepsia major

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