Dictionary

knee jerk

noun

Definition of KNEE JERK

:  an involuntary forward kick produced by a light blow on the tendon below the patella

First Known Use of KNEE JERK

1876
Medical Dictionary

knee jerk

noun

Medical Definition of KNEE JERK

:  an involuntary forward jerk or kick produced by a light blow or sudden strain upon the patellar ligament of the knee that causes a reflex contraction of the quadriceps muscle—called also patellar reflex

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