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[adj., n. ree-fleks; v. ri-fleks] /adj., n. ˈri flɛks; v. rɪˈflɛks/
Physiology. noting or pertaining to an involuntary response to a stimulus, the nerve impulse from a receptor being transmitted inward to a nerve center that in turn transmits it outward to an effector.
occurring in reaction; responsive.
cast back; reflected, as light, color, etc.
bent or turned back.
designating a radio apparatus in which the same circuit or part performs two functions.
  1. Also called reflex act. movement caused by a reflex response.
  2. Also called reflex action. the entire physiological process activating such movement.
any automatic, unthinking, often habitual behavior or response.
the reflection or image of an object, as exhibited by a mirror or the like.
a reproduction, as if in a mirror.
a copy; adaptation.
reflected light, color, etc.
Historical Linguistics. an element in a language, as a sound, that has developed from a corresponding element in an earlier form of the language:
The (ō) in “stone” is a reflex of Old English ā.
a reflex radio receiver.
a reflex camera.
verb (used with object)
to subject to a reflex process.
to bend, turn, or fold back.
to arrange in a reflex system.
1500-10; < Latin reflexus bent back, past participle of reflectere to reflect
Related forms
reflexly, adverb
reflexness, noun
multireflex, noun
semireflex, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for reflexes
  • Some other photographers may have the same or better command of their equipment, quick reflexes and an eye for composition.
  • His reflexes guarantee no coffee spills on rare books.
  • There is a haunting prehistoric ritual still conditioned into every human being's reflexes.
  • But brainpower is your primary weapon rather than quick reflexes.
  • The brain stem is the area which controls the reflexes of hunger and breathing.
  • Securing the portraits required tenacity, quick reflexes and the wiles of a fixer.
  • The people are much more disciplined under one government, if patriotic reflexes remain tense.
  • Beyond these protective and nutritional reflexes, however, taste preferences are largely a matter of culture and learning.
  • Secularist reflexes of the elites should not shadow the reason.
  • It's a fun little test of reflexes, challenging you to sedate any sheep that makes a break for it.
British Dictionary definitions for reflexes


noun (ˈriːflɛks)
  1. an immediate involuntary response, esp one that is innate, such as coughing or removal of the hand from a hot surface, evoked by a given stimulus
  2. (as modifier): a reflex action See also reflex arc
  1. a mechanical response to a particular situation, involving no conscious decision
  2. (as modifier): a reflex response
a reflection; an image produced by or as if by reflection
a speech element derived from a corresponding form in an earlier state of the language: "sorrow" is a reflex of Middle English "sorwe"
adjective (ˈriːflɛks)
(maths) (of an angle) between 180° and 360°
(prenominal) turned, reflected, or bent backwards
verb (rɪˈflɛks)
(transitive) to bend, turn, or reflect backwards
Derived Forms
reflexible, adjective
reflexibility, noun
Word Origin
C16: from Latin reflexus bent back, from reflectere to reflect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for reflexes



c.1500, "reflection of light," from verb reflex meaning "refract, deflect" (late 14c.), from Late Latin reflexus "a bending back," noun use of past participle of reflectere (see reflection). Meaning "involuntary nerve stimulation" first recorded 1877, from reflex action (1833).

Online Etymology Dictionary, © 2010 Douglas Harper
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reflexes in Medicine

reflex re·flex (rē'flěks')

  1. An involuntary physiological response to a stimulus.

  2. An unlearned or instinctive response to a stimulus.

  3. Something, such as light or heat, that is reflected.

  1. Being an involuntary action or response, such as a sneeze, blink, or hiccup.

  2. Bent, turned, or thrown back; reflected.

v. re·flexed, re·flex·ing, re·flex·es (rĭ-flěks')
  1. To cause to undergo a reflex process.

  2. To reflect.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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reflexes in Science
  1. An involuntary physiological response to a stimulus, as the withdrawal of a body part from burning heat.

  2. An unlearned or instinctive response to a stimulus. Also called unconditioned response. See more at classical conditioning.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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reflexes in Culture

reflex definition

An action or movement not controlled by conscious thought. A reflex may be anything from a hiccup to the involuntary response of a body part, such as the action that occurs in the knee-jerk reflex.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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