We're working on a new site. Click here to get a sneak preview.
Medical Dictionary


noun boost·er \ˈbü-stər\

Medical Definition of BOOSTER

:  a substance that increases the effectiveness of a medicament; especially :  booster shot


How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears