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Noun

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methicillin (countable and uncountable, plural methicillins)

  1. (pharmacology) Alternative spelling of meticillin.
    • 2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), page 53:
      The new strain was dubbed methicillin-resistant Staphylococcus aureus, or MRSA.