booster shot


Definition of booster shot

: a supplementary dose of an immunizing agent administered as an injection

called also booster, booster dose

Examples of booster shot in a Sentence

He had to get two booster shots at his latest checkup.
Recent Examples on the Web Uncertainty about the length of immunity from the vaccine also raised questions of whether a booster shot would be regularly needed. Mark Klempner, The Conversation, "A Lyme disease vaccine doesn’t exist, but a yearly antibody shot shows promise at preventing infection," 4 June 2020 For example, it’s recommended that adults receive a Td booster shot every 10 years to protect against tetanus and diphtheria. Trihealth,, "Top 5 questions to ask your primary care physician," 16 Apr. 2018

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

First Known Use of booster shot

1944, in the meaning defined above

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The first known use of booster shot was in 1944

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Last Updated

22 Jun 2020

Cite this Entry

“Booster shot.” Dictionary, Merriam-Webster, Accessed 3 Jul. 2020.

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More Definitions for booster shot

booster shot


English Language Learners Definition of booster shot

chiefly US : an extra amount of a substance (called a vaccine) that is injected with a needle into a person or animal to help protect against a particular disease

booster shot


Medical Definition of booster shot

: a supplementary dose of an immunizing agent administered as an injection … the state is requiring older children to have additional booster shots for measles, mumps and rubella.— Ann Schrader, The Denver Post, 22 July 1997 — see booster, booster dose

More from Merriam-Webster on booster shot

Rhyming Dictionary: Words that rhyme with booster shot

Nglish: Translation of booster shot for Spanish Speakers

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