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Word of the Day Wednesday, June 10, 2026

fasciculation

/fæsɪkjʊˈleɪʃən/ noun · British & US
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What does fasciculation mean?

noun

A small, localized muscle twitch, often visible under the skin, caused by the spontaneous discharge of a group of muscle fibers. This can be a normal physiological response or a sign of a neurological disorder.

Example

"The doctor observed fasciculations in the patient's arm, which suggested a possible case of amyotrophic lateral sclerosis."

Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.

Etymologically related

Synonyms for fasciculation

Rhymes with fasciculation