Meanings
nounbooster shot (plural booster shots)
plural booster shots
- A dose of an antigen (usually a vaccine) designed to strengthen immunity after an earlier immunizing dose.
Synonyms: booster dose, booster injection
Synonyms & antonyms
nounA dose of an antigen (usually a vaccine) designed to strengthen immunity after an earlier immunizing dose.
More synonyms by meaning
nounan additional dose that makes sure the first dose was effective
Similar
Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
booster shot. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/booster%20shot
MLA
“booster shot.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/booster%20shot. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “booster shot,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/booster%20shot.
Source: booster shot on Wiktionary, CC BY-SA 4.0.