an ‧ ti ‧ bi ‧ ot ‧ ic /ˌæntɪbaɪˈɒtɪk◂ $ -ˈɑː-/ BrE AmE noun [countable usually plural]
[ Date: 1800-1900 ; Origin: anti- + biotic 'of life' (19-21 centuries) (from Latin bioticus , from Greek , from bios 'life' ) ]
a drug that is used to kill ↑ bacteria and cure infections