a person or thing that inhibits.
Chemistry. a substance that decreases the rate of or stops completely a chemical reaction.
any impurity in a mineral that prevents luminescence. Compare activator ( def 3 ).
Rocketry. an inert antioxidant used with solid propellants to inhibit burning on certain surfaces.
Also, inhibiter.

1865–70; inhibit + -or2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inhibitor (ɪnˈhɪbɪtə)
1.  Also called: inhibiter a person or thing that inhibits
2.  Compare catalyst Also called: anticatalyst a substance that retards or stops a chemical reaction
3.  biochem
 a.  a substance that inhibits the action of an enzyme
 b.  a substance that inhibits a metabolic or physiological process: a plant growth inhibitor
4.  any impurity in a solid that prevents luminescence
5.  an inert substance added to some rocket fuels to inhibit ignition on certain surfaces

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

inhibitor in·hib·i·tor or in·hib·it·er (ĭn-hĭb'ĭ-tər)

  1. A substance that restrains or retards physiological, chemical, or enzymatic action.

  2. A nerve whose stimulation represses activity.

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 those extra blood vessels are no longer needed, the body prunes them back
  to baseline, using naturally occurring inhibitors.
Aldosterone inhibitors or digitalis may be used for some patients.
Proton-pump or acid-pump inhibitors are probably the best drug treatments for
  reflux symptoms related to scleroderma.
Dietary restrictions and drug interactions with monoamine oxidase inhibitors:
  the state of the art.
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