booster shot booster rocket • booster station · · · Info · Definitions · Synonyms · Characters · · booster shot · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) an additional dose that makes sure the first dose was effective. Synonyms: booster, booster dose, booster shot, recall dose. · · Noun Definition 1 Synonyms · · · booster · · Synonym 1 booster dose · · Synonym 2 recall dose · · Synonym 3 Characters · · space U+0020 b latin small letter b U+0062 e latin small letter e U+0065 h latin small letter h U+0068 o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074