"antibiotic" in the noun sense
1. antibiotic, antibiotic drug
a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections
"when antibiotics were first discovered they were called wonder drugs"
"antibiotic" in the adjective sense
1. antibiotic
of or relating to antibiotic drugs
Source: WordNet® (An amazing lexical database of English)
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