The Wayback Machine - https://web.archive.org/web/20210226153704/https://www.merriam-webster.com/dictionary/vaccine

vaccine

noun
vac·​cine | \ vak-ˈsēn How to pronounce vaccine (audio) , ˈvak-ˌsēn \

Definition of vaccine

: a preparation that is administered (as by injection) to stimulate the body's immune response against a specific infectious disease:
a : an antigenic preparation of a typically inactivated or attenuated (see attenuated sense 2) pathogenic agent (such as a bacterium or virus) or one of its components or products (such as a protein or toxin)
b : a preparation of genetic material (such as a strand of synthesized messenger RNA) that is used by the cells of the body to produce an antigenic substance (such as a fragment of virus spike protein)

Keep scrolling for more

Other Words from vaccine

vaccine adjective

Examples of vaccine in a Sentence

Recent Examples on the Web Macron referred to a massive hack of U.S. federal agencies last year and to the stealing of vaccine documents from the European Medicine Agency in November. Sylvie Corbet, Star Tribune, "France to boost cyberdefense after hospital malware attacks," 18 Feb. 2021 Most Mainers won't get access to the vaccine for many months, state health officials have cautioned. Christian Wade, Washington Examiner, "Maine puts vaccine providers on notice after reports of ineligible recipients given doses," 18 Feb. 2021 Pfizer/BioNTech vaccine weaker against South African variant, study says. Editors, USA TODAY, "Winter storm, GameStop hearing, NASA's Perseverance to land on Mars: 5 things to know Thursday," 18 Feb. 2021 Some Army units are seeing as few as one-third agree to the vaccine. Arkansas Online, "Thousands of service members saying no to covid-19 vaccine," 18 Feb. 2021 The Balazs Lab, a research group affiliated with Mass General, Harvard, and MIT, tweeted about the B.1.351 variant’s possible resistance to the vaccine Sunday. Globe Staff, BostonGlobe.com, "What we know about the South African coronavirus variant found in Mass.," 17 Feb. 2021 The bigger concern with those is immune escape [when the virus mutates in such a way that immune protection from an earlier infection or a vaccine isn’t as robust]. Andrew Joseph, STAT, "Q&A;: How the U.S. can respond to coronavirus variants, and prepare for future evolution," 17 Feb. 2021 Mozeliak also expressed hope that some staff and players could begin receiving the COVID-19 vaccine by opening day. Steve Megargee, ajc, "Players return to COVID protocols as spring training opens," 17 Feb. 2021 Despite these challenges, the state has one of the best vaccine distribution records in the country. John Knefel, The New Republic, "Don’t Let Amazon and Airbnb Get Their Tentacles in Vaccine Distribution," 17 Feb. 2021

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

See More

First Known Use of vaccine

1882, in the meaning defined above

History and Etymology for vaccine

earlier, "fluid from cowpox pustules used in inoculation," noun use of vaccine "of cowpox" (in the phrases vaccine disease, vaccine matter), borrowed from New Latin vaccina (in variolae vaccinae "cowpox"), going back to Latin, feminine of vaccīnus "of or from a cow," from vacca "cow" (perhaps akin to Sanskrit vaśā "cow") + -īnus -ine entry 1; in extended sense, "preparation of organisms administered to produce immunity," in part borrowed from French vaccin, masculine derivative of vaccine "cowpox, matter from cowpox pustules," borrowed from New Latin or English

Keep scrolling for more

Learn More about vaccine

Time Traveler for vaccine

Time Traveler

The first known use of vaccine was in 1882

See more words from the same year

Statistics for vaccine

Last Updated

22 Feb 2021

Cite this Entry

“Vaccine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vaccine. Accessed 26 Feb. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Keep scrolling for more

More Definitions for vaccine

vaccine

noun

English Language Learners Definition of vaccine

medical : a substance that is usually injected into a person or animal to protect against a particular disease

vaccine

noun
vac·​cine | \ vak-ˈsēn How to pronounce vaccine (audio) , ˈvak-ˌsēn \

Kids Definition of vaccine

: a preparation containing usually killed or weakened microorganisms (as bacteria or viruses) that is given usually by injection to increase protection against a particular disease

vaccine

noun
vac·​cine | \ vak-ˈsēn, ˈvak-ˌ How to pronounce vaccine (audio) \

Medical Definition of vaccine

1 : matter or a preparation containing the virus of cowpox used to vaccinate a person against smallpox
2 : a preparation that is administered (as by injection) to stimulate the body's immune response against a specific infectious disease:
a : an antigenic preparation of a typically inactivated or attenuated pathogenic agent (such as a bacterium or virus) or one of its components or products (such as a protein or toxin)
b : a preparation of genetic material (such as a strand of synthesized messenger RNA) that is used by the cells of the body to produce an antigenic substance (such as a fragment of virus spike protein)

Keep scrolling for more

More from Merriam-Webster on vaccine

Nglish: Translation of vaccine for Spanish Speakers

Britannica English: Translation of vaccine for Arabic Speakers

Britannica.com: Encyclopedia article about vaccine

Comments on vaccine

What made you want to look up vaccine? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

February 2021 Words of the Day Quiz

  • squirrel in winter
  • Which is a synonym of perdure?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!