Definition of penicillin noun from the Oxford Advanced American Dictionary

 

penicillin

 noun
noun
NAmE//ˌpɛnəˈsɪlən//
 
[uncountable]
 
jump to other results
a substance obtained from mold, used as a drug to treat or prevent infections caused by bacteria; a type of antibiotic
See the Oxford Advanced Learner's Dictionary entry: penicillin