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Spasm

From Biology-Online Dictionary | Biology-Online Dictionary
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spasm

1. (Science: physiology) A sudden, violent, involuntary contraction of a muscle or a group of muscles, attended by pain and interference with function, producing involuntary movement and distortion.

2. A sudden but transitory constriction of a passage, canal or orifice.

Origin: L. Spasmus, Gr. Spasmos