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reactive

[ree-ak-tiv] /riˈæk tɪv/
adjective
1.
tending to react.
2.
pertaining to or characterized by reaction.
3.
Electricity. pertaining to or characterized by reactance.
Origin
1705-1715
1705-15; react + -ive
Related forms
reactively, adverb
reactiveness, noun
antireactive, adjective
hyperreactive, adjective
nonreactive, adjective
overreactive, adjective
unreactive, adjective
Can be confused
proactive, reactionary, reactive.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for reactive
  • When the coating gets scratched, the polyurethane rings break open, creating two reactive ends.
  • When a coral is broken or wounded, it releases highly reactive atoms of oxygen known as free radicals to close up the gashes.
  • Many say the agency became more reactive than proactive.
  • As the reactive branch of government, the federal judiciary has been disinclined to get too closely involved.
  • Instead of being flexible and responsive, the existing structure is rigid and reactive.
  • They're at risk for burnout, grief and reactive depression and need coping strategies themselves.
  • The system might more properly be described as reactive, in that it responds to sound waves already headed toward human ears.
  • Community policing is a broad term generally meaning an approach to law enforcement that's proactive instead of reactive.
  • The wind energy industry typically uses a reactive maintenance approach or run-to-failure maintenance.
  • Also, an ever present problem with energetic water reactive materials is humidity.
British Dictionary definitions for reactive

reactive

/rɪˈæktɪv/
adjective
1.
readily partaking in chemical reactions sodium is a reactive metal, free radicals are very reactive
2.
of, concerned with, or having a reactance
3.
responsive to stimulus
4.
(of mental illnesses) precipitated by an external cause reactive depression
Derived Forms
reactively, adverb
reactivity (ˌriːækˈtɪvɪtɪ), reactiveness, noun
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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reactive in Medicine

reactive re·ac·tive (rē-āk'tĭv)
adj.

  1. Tending to be responsive or to react to a stimulus.

  2. Characterized by reaction.

  3. Tending to participate readily in chemical reactions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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