Wiktionary
meticillin
n. (context medicine English) A beta-lactam antibiotic related to penicillin
Wikipedia
Meticillin
Meticillin ( INN, BAN) or methicillin ( USAN, AAN) is a narrow-spectrum β-lactam antibiotic of the penicillin class. It should not be confused with the antibiotic metacycline. In 2005, the name of the drug was changed from methicillin to meticillin in accordance with the International Pharmacopoeia guidelines.