Definition of athetosis in US English:

athetosis

noun

Medicine
  • A condition in which abnormal muscle contractions cause involuntary writhing movements. It affects some people with cerebral palsy, impairing speech and use of the hands.

    • ‘Because of increased physical activity through involuntary movements, non-ambulatory children with athetosis are hyperactive and may have increased energy expenditure.’

Origin

Late 19th century: from Greek athetos ‘without position’ + -osis.

Pronunciation

athetosis

/ˌaTHəˈtōsəs/