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muscle spasm

n.
  1. Persistent increased tension and shortness in a muscle or group of muscles that cannot be released voluntarily.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Related Words for muscle spasm

cramp, pain, stitch, pinch, twinge, crick, pang, knot, tweak, stab