Definition of antibiotic noun from the Oxford Advanced Learner's Dictionary

 

antibiotic

 noun
noun
BrE BrE//ˌæntibaɪˈɒtɪk//
 
; NAmE NAmE//ˌæntibaɪˈɑːtɪk//
 
[usually plural]
 
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a substance, for example penicillin, that can destroy or prevent the growth of bacteria and cure infections The doctor put her on antibiotics (= told her to take them). Word Origin mid 19th cent. (in the sense ‘doubting the possibility of life in a certain environment’): from anti- + Greek biōtikos ‘fit for life’ (from bios ‘life’).Extra examples I got an antibiotic for my ear infection. Meat from animals that receive antibiotics could not be classified as organic. The doctor prescribed antibiotics. The doctor put her on a course of antibiotics.

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