| clonus | <neurology, physiology> A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession. (13 Nov 1997) |
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| ankle clonus | A rhythmical contraction of the calf muscles following a sudden passive dorsiflexion of the foot, the leg being semiflexed. (05 Mar 2000) |
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| cathodal opening clonus | An obsolete term for a clonus produced near a cathode when the flow of current is stopped. (05 Mar 2000) |
| wrist clonus | Rhythmical contractions and relaxations of the muscles of the forearm excited by a forcible passive extension of the hand. (05 Mar 2000) |
| wrist clonus reflex | Sudden extension of the wrist induces a sustained clonic movement. (05 Mar 2000) |
| subsultus clonus | A twitching of the tendons, especially noticeable at the wrist, occurring in low fevers. Synonym: subsultus clonus, tremor tendinum. (05 Mar 2000) |
| toe clonus | Alternating movements of flexion and extension of the great toe following forcible extension at the metatarsophalangeal joint. (05 Mar 2000) |