Definition of antibiotic noun from the Oxford Advanced American Dictionary

 

antibiotic

 noun
noun
NAmE//ˌæntɪbaɪˈɑt̮ɪk//
 
, NAmE//ˌæntaɪ‑//
 
[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).
antibioticadjective
 
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an antibiotic drug effective antibiotic treatment