or in·hib·it·er

[ in-hib-i-ter ]
/ ɪnˈhɪb ɪ tər /
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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.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of inhibitor

First recorded in 1865–70; inhibit + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use inhibitor in a sentence

British Dictionary definitions for inhibitor

/ (ɪnˈhɪbɪtə) /

Also called: inhibiter a person or thing that inhibits
Also called: anticatalyst a substance that retards or stops a chemical reactionCompare catalyst
  1. a substance that inhibits the action of an enzyme
  2. a substance that inhibits a metabolic or physiological processa plant growth inhibitor
any impurity in a solid that prevents luminescence
an inert substance added to some rocket fuels to inhibit ignition on certain surfaces
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

Medical definitions for inhibitor


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