Dictionary
knee jerk
noun
Definition of KNEE JERK
: an involuntary forward kick produced by a light blow on the tendon below the patella
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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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