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Answer for the clue "A clonic spasm of a muscle or muscle group ", 9 letters:
myoclonus

Word definitions for myoclonus in dictionaries

Wikipedia Word definitions in Wikipedia
Myoclonus is a brief, involuntary twitching of a muscle or a group of muscles. It describes a medical sign and, generally, is not a diagnosis of a disease . These myoclonic twitches , jerks , or seizures are usually caused by sudden muscle contractions ...

WordNet Word definitions in WordNet
n. a clonic spasm of a muscle or muscle group

Wiktionary Word definitions in Wiktionary
n. (context medicine English) The brief, involuntary twitching of a muscle or group of muscles.

Usage examples of myoclonus.

An old veteran of time travel, the chronoplates did not affect him as profoundly as they did most soldiers, who usually vomited upon arrival and suffered from temporary bouts of vertigo and myoclonus, as well as double vision and ataxia.