antiviral

1 of 2

adjective

an·​ti·​vi·​ral ˌan-tē-ˈvī-rəl How to pronounce antiviral (audio)
ˌan-tī-
1
medical : acting, effective, or directed against viruses
an antiviral vaccine/drug
2
: used to protect a computer from viruses : antivirus
antiviral software

antiviral

2 of 2

noun

: an antiviral agent and especially a drug
antivirals used in treating influenza

Examples of antiviral in a Sentence

Recent Examples on the Web
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Adjective
Antibiotics only treat bacterial forms of pneumonia, however, and antiviral medications are used to treat viral forms for the disease, Diuguid-Gerber explains. Daryl Austin, USA Today, 25 May 2025 Immunization Offers the Best Protection The measles vaccine is highly effective and safe, and because there are no antiviral medications to treat measles, immunization is the best protection, according to Chin-Hong. Emily Kay Votruba, EverydayHealth.com, 13 May 2025
Noun
While budesonide can help with lung inflammation and clarithromycin can fight off co-infections from other germs, Campbell cautioned that neither were antivirals for fighting the measles virus infection itself. Nicole Brown Chau, CBS News, 1 May 2025 There are no antivirals or treatments specifically indicated for measles. Joseph Choi, The Hill, 18 Mar. 2025 See All Example Sentences for antiviral

Word History

First Known Use

Adjective

1929, in the meaning defined at sense 1

Noun

1959, in the meaning defined above

Time Traveler
The first known use of antiviral was in 1929

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Cite this Entry

“Antiviral.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antiviral. Accessed 6 Jun. 2025.

Medical Definition

antiviral

1 of 2 adjective
an·​ti·​vi·​ral -ˈvi-rəl How to pronounce antiviral (audio)
variants also antivirus
: acting, effective, or directed against viruses
antiviral drugs

antiviral

2 of 2 noun
: an antiviral agent and especially a drug
Last Updated: - Updated example sentences
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