Wordnet 3.0
NOUN (1)
1. 
 a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections; 
- Example: "when antibiotics were first discovered they were called wonder drugs"[syn: antibiotic, antibiotic drug]
WordNet (r) 3.0 (2006):
antibiotic drug
    n 1: 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" [syn: antibiotic, antibiotic drug]