entasia

/ɛnˈteɪʒə/
noun
  1. A rare term for a type of spasm or convulsion, especially one involving tension or rigidity.
    • The patient experienced a sudden entasia in his leg muscles after the long run.
    • Doctors observed an entasia that caused the athlete's arm to lock up during the competition.
    • The old medical text described entasia as a painful, involuntary muscle contraction.
Antonyms