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patellar reflex

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noun
  1. knee jerk.

Origin of patellar reflex

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
patellar reflex in Medicine

patellar reflex

n.
  1. A reflex contraction of the quadriceps muscle resulting in a sudden involuntary extension of the leg, produced by a sharp tap to the tendon below the patella.knee jerk knee-jerk reflex knee reflex quadriceps reflex
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.