antibiotic /ˌantɪbʌɪˈɒtɪk/

a

I. noun

a medicine (such as penicillin or its derivatives) that inhibits the growth of or destroys microorganisms.

course of antibiotics.
[ mass noun]
an injection of antibiotic.
II. adjective

relating to antibiotics.

a prolonged course of antibiotic therapy.
– origin mid 19th cent. (in the sense ‘doubting the possibility of life in a particular environment’): from anti- + Greek biōtikos ‘fit for life’ (from bios ‘life’).

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