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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 from the web for unreactive
  • Reactions nitrogen is generally unreactive at standard temperature and pressure.
British Dictionary definitions for unreactive

unreactive

/ˌʌnrɪˈæktɪv/
adjective
1.
(of a substance) not readily partaking in chemical reactions

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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Word Origin and History for unreactive

reactive

adj.

1712, from react + -ive. Related: Reactively; reactiveness; reactivity.

Online Etymology Dictionary, © 2010 Douglas Harper
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unreactive 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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