CONVULSION

convulsion. Convulsion, n. an irregular and violent motion

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Con‐vul″sion (?), n. [[L. convulsio: cf. F. convulsion.]] 1. 1. (Med.) An unnatural, violent, and unvoluntary contraction of the muscular parts of an animal body.
2. 2. Any violent and irregular motion or agitation; a violent shaking; a tumult; a commotion.
Those two massy pillars, With horrible convulsion, to and fro He tugged, he shook, till down they came. Milton. Times of violence and convulsion. Ames. Syn. — Agitation; commotion; tumult; disturbance.