• noun
• synonym
• antonym

• penicillin F (noun)
  1. the first form of penicillin that was isolated in Great Britain
• penicillin G (noun)
  1. the penicillin that constitutes the principal component of many commercial antibiotics
• penicillin O (noun)
  1. a penicillin that is similar in antibiotic action to penicillin G but is obtained differently
• penicillin V (noun)
  1. a crystalline penicillin similar in action to penicillin G but more resistant to the action of gastric acids
• penicillin V potassium (noun)
  1. trade name Ledercillin VK a form of penicillin V
• penicillin-resistant (adjective)
  1. unaffected by penicillin
• penicillin-resistant bacteria (noun)
  1. bacteria that are unaffected by penicillin
• phenoxymethyl penicillin (noun)
  1. a crystalline penicillin similar in action to penicillin G but more resistant to the action of gastric acids
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