A chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections(noun)
WordNet. Princeton University. 2010.
Use "antibiotic drug" in a sentence
"Tetracycline, the new antibiotic drug whose diffusion among medical doctors was studied by Coleman and others 1996, was similar to two previously introduced antibiotics that it partially replaced but superior to them in its lack of unpleasant side effects."