inhibitor

noun

in·​hib·​i·​tor in-ˈhi-bə-tər 

: 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

Over the past decade, multiple trials have investigated letrozole, an oral aromatase inhibitor used for ovulation induction and breast cancer treatment, as an alternative to mifepristone. —Christine Henneberg, STAT, 15 May 2026

Much of the conversation around potential risks has centered on selective-serotonin reuptake inhibitors, which are known as SSRIs and are the most prescribed class of antidepressants. —Kristen Rogers, CNN Money, 14 May 2026

In addition, healthcare providers may prescribe medications to help lower blood pressure, such as ACE inhibitors, beta-blockers, diuretics, or other options. —Ashley Olivine, Verywell Health, 14 May 2026

When using a purchased potato, look for an organic variety less likely to have been treated with a sprout inhibitor. —Barbara Gillette, The Spruce, 10 May 2026

Word History

First Known Use

circa 1611, in the meaning defined above

Phrases Containing inhibitor

• ACE inhibitor
• protease inhibitor
• proton pump inhibitor
• selective serotonin reuptake inhibitor

Rhymes for inhibitor

• exhibitor

Medical Definition

inhibitor

noun

in·​hib·​i·​tor in-ˈhib-ət-ər 

: 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