knee jerk


Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.

knee jerk

n.
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; patellar reflex.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

knee jerk

n
(Physiology) physiol Also called: patellar reflex an outward reflex kick of the lower leg caused by a sharp tap on the quadriceps tendon just below the patella
adj
made or occurring as a predictable and automatic response, without thought: kneejerk support.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

knee′ jerk`



n.
a reflex extension of the leg resulting from a sharp tap on the patellar tendon.
[1875–80]

knee′-jerk`



adj.
Informal. reacting in an automatic, habitual manner; unthinking: a knee-jerk liberal.
[1895–1900]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.knee jerk - a reflex extension of the leg resulting from a sharp tap on the patellar tendon
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

knee jerk

n. reflejo de la rodilla que se produce con el toque de un martillo de goma en el ligamento de la patela.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
The knee jerk can also be helpful in recognising thyroid disease.
We reject the knee jerk allegations by some Afghan circles to point the finger at Pakistan for the terrorist attack on intercontinental hotel in Kabul.
"There should not be knee jerk reactions; resignations by anyone will not yield any results