epilepsy

noun

ep·​i·​lep·​sy ˈe-pə-ˌlep-sē How to pronounce epilepsy (audio)
plural epilepsies
: any of various disorders marked by abnormal electrical discharges in the brain and typically manifested by sudden brief episodes of altered or diminished consciousness, involuntary movements, or convulsions

Examples of epilepsy in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Before allowing your pup to get in the water, they should be examined by a veterinarian for conditions such as arthritis, heart disease or epilepsy, a brain disorder that causes repeated seizures, says the VCA, the animal hospital chain. Soo Kim, MSNBC Newsweek, 6 June 2025 In a case in Nature Medicine, a premature baby with a devastating genetic epilepsy syndrome achieved a 60% reduction in life-threatening seizures following treatment with an experimental therapy. William A. Haseltine, Forbes.com, 2 June 2025 The common epilepsy drug carbamazepine was developed to treat the shooting nerve pain of trigeminal neuralgia, which is described as feeling like a hatchet to the head and is often called the suicide pain. Rivka Galchen, New Yorker, 26 May 2025 Used to record the brain’s electrical activity, an EEG is important for diagnosing and monitoring neurological conditions such as epilepsy, seizures, sleep disorders, and brain damage. New Atlas, 5 May 2025 See All Example Sentences for epilepsy

Word History

Etymology

Middle English epilencie, from Anglo-French & Latin; Anglo-French epelempsie, modification of Late Latin epilepsia, from Greek epilēpsia, from epilambanein to seize, from epi- + lambanein to take, seize — more at latch

First Known Use

1543, in the meaning defined above

Time Traveler
The first known use of epilepsy was in 1543

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Cite this Entry

“Epilepsy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epilepsy. Accessed 10 Jun. 2025.

Kids Definition

epilepsy

noun
ep·​i·​lep·​sy ˈep-ə-ˌlep-sē How to pronounce epilepsy (audio)
: a disorder marked by abnormal electrical discharges in the brain, by attacks of convulsions, and by loss of consciousness

Medical Definition

epilepsy

noun
ep·​i·​lep·​sy ˈep-ə-ˌlep-sē How to pronounce epilepsy (audio)
plural epilepsies
: any of various disorders marked by abnormal electrical discharges in the brain and typically manifested by sudden brief episodes of altered or diminished consciousness, involuntary movements, or convulsions see absence epilepsy, grand mal sense 1, petit mal sense 1 focal epilepsy, jacksonian epilepsy, myoclonic epilepsy, temporal lobe epilepsy

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