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| 1. | Pathology. a sudden, abnormal, involuntary muscular contraction, consisting of a continued muscular contraction (tonic spasm) or of a series of alternating muscular contractions and relaxations (clonic spasm). |
| 2. | any sudden, brief spell of great energy, activity, feeling, etc. |

clonic spasm n.
Alternate involuntary contraction and relaxation of a muscle.
spasm (spāz'əm)
n.
A sudden involuntary contraction of a muscle or group of muscles.
A muscle spasm.