penicillin
noun
Penicillin is an antibiotic that cures diseases caused by bacteria, such as a wound infection or pneumonia. Penicillin attacks many types of bacteria by either killing them or stopping them from working. Penicillin can be taken in many forms: as a syrup, in tablets, as a cream or injected into a vein.
Penicillin was the first antibiotic ever invented.
penicillin
