reactive

[ree-ak-tiv]
adjective
1.
tending to react.
2.
pertaining to or characterized by reaction.
3.
Electricity. pertaining to or characterized by reactance.

Origin:
1705–15; react + -ive

reactively, adverb
reactiveness, noun
antireactive, adjective
hyperreactive, adjective
nonreactive, adjective
overreactive, adjective
unreactive, adjective

proactive, reactionary, reactive.
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World English Dictionary
reactive (rɪˈæktɪv)
 
adj
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
 
re'actively
 
adv
 
reactivity
 
n
 
re'activeness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

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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Example sentences
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.
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