| NOUN | act | knee-jerk reflex, knee jerk, patellar reflex | a reflex extension of the leg resulting from a sharp tap on the patellar tendon |
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| Meaning | A reflex extension of the leg resulting from a sharp tap on the patellar tendon. | |
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| Synonyms | knee jerk, patellar reflex | |
| Broader | reflex, reflex response, reflex action, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction | An automatic instinctive unlearned reaction to a stimulus |
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