Dictionary

booster shot

noun

: 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

Full Definition of BOOSTER SHOT

:  a supplementary dose of an immunizing agent —called also booster, booster dose
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First Known Use of BOOSTER SHOT

1944
Medical Dictionary

booster shot

noun

Medical Definition of BOOSTER SHOT

:  a supplementary dose of an immunizing agent—called also booster, booster dose

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