Rigidity of the extensor muscles of a joint that gives resistance to passive flexion but gives way abruptly to allow easy flexion, resulting from an exaggeration of the stretch reflex.clasp-knife rigidity
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Words nearby clasp-knife spasticity
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.