noun
muscle stiffness; muscle rigidity
Medical term for abnormal muscle tightness or rigidity, often used in contexts like rigor mortis or pathological stiffness.
死後、筋硬直が起こる。
After death, muscle stiffness occurs.
筋硬直は神経疾患の症状として現れることがある。
Muscle rigidity can appear as a symptom of neurological disorders.
筋肉 means 'muscle' in general. 筋硬直 is the condition of muscle stiffness.
Compound of 筋 (きん, 'muscle') and 硬直 (こうちょく, 'stiffness, rigidity').