in·​hib·​i·​tor | \ in-ˈhi-bə-tər How to pronounce inhibitor (audio) \

Definition of inhibitor

: one that inhibits: such as
a : an agent that slows or interferes with a chemical action
b : a substance that reduces or suppresses the activity of another substance (such as an enzyme)

Examples of inhibitor in a Sentence

Recent Examples on the Web For instance, if you are diagnosed with ovarian cancer and have a BRCA1 or BRCA2 mutation, a PARP inhibitor might be helpful. Korin Miller, Good Housekeeping, "What You Should Know About Your BRCA Status And Ovarian Cancer Risk," 9 Feb. 2021 This new research involved the identification of specific inhibitor molecules that would make radiation more effective in fighting brain cancer. Linda Gandee, cleveland, "Prayers From Maria has raised more than $7 million for cancer research," 25 Jan. 2021 One reason is fewer people are smoking, and improved treatments like epidermal growth-factor receptor tyrosine-kinase inhibitor are able to target non-small cell lung cancer mutations. The Editorial Board, WSJ, "The Good News on Cancer," 14 Jan. 2021 Similarly, another group of scientists saw improvements in CLL patients from a combined treatment of a BTK inhibitor and a monoclonal antibody. Scientific American, "An Ongoing Revolution in Blood Cancer," 1 Dec. 2020 The team found that in domestic cats, Wnt and Dkk4, respectively, are the activator and inhibitor. Elizabeth Pennisi, Science | AAAS, "How cats get their stripes," 2 Dec. 2020 Currently there is no inhibitor to arrest metastasis. Larry Luxner,, "Israeli scientists pioneering new, less invasive breast cancer detection methods," 18 Nov. 2020 As a physician and Black woman, Bea believes that a main inhibitor for the Black community to seeking health care is the absence of doctors who can relate to their life experiences. NBC News, "Why Black women face disproportionate rates of breast cancer," 11 Oct. 2020 In fact, starting on the MAO-B inhibitor selegiline can help patients go up to a year longer before needing to start on levodopa at all, says the NINDS. Marygrace Taylor, Good Housekeeping, "Treatment Options for Parkinson’s Everyone With The Disease Should Know About," 1 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'inhibitor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of inhibitor

circa 1611, in the meaning defined above

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Time Traveler for inhibitor

Time Traveler

The first known use of inhibitor was circa 1611

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Statistics for inhibitor

Last Updated

24 Feb 2021

Cite this Entry

“Inhibitor.” Dictionary, Merriam-Webster, Accessed 5 Mar. 2021.

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More Definitions for inhibitor


in·​hib·​i·​tor | \ in-ˈhib-ət-ər How to pronounce inhibitor (audio) \

Medical Definition of inhibitor

: one that inhibits: as
a : an agent that slows or interferes with a chemical reaction
b : a substance that reduces the activity of another substance (as an enzyme)
c : a gene that checks the normal effect of another nonallelic gene when both are present

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