- 1: A sudden attack (as of disease); especially: the physical manifestations (as convulsions, sensory disturbances, or loss of consciousness) resulting from abnormal electrical discharges in the brain (as in epilepsy).
2: An abnormal electrical discharge in the brain.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
- Convulsions; sudden, involuntary movements of the muscles.
National Cancer Institute
See also Understanding Medical Terminology.