Describing a seizure or muscle condition that combines both clonic (rhythmic jerking) and tonic (rigid stiffness) movements.
Compound of clonic + tonic, both from Greek roots (klonos 'turmoil' + tonos 'tension').
The most common type of epileptic seizure people think of—called 'grand mal'—is actually clonicotonic, starting with the body going rigid then shaking violently.
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