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spasm| In medicine, a sudden, involuntary contraction of a muscle or of a hollow organ with a muscular wall. |
| A tonic spasm describes a spasm in which the contraction persists for some time followed by sudden or gradual relaxation, whilst clonic spasm is characterized by a series of contractions and relaxations of the muscle. Cramps are spasms that affect the limbs and colic describes spasms of the stomach and intestinal walls. |
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