meticillin

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meticillin (methicillin) (met-i-sil-in) n. a semisynthetic penicillin formerly used to treat infections caused by staphylococci that destroy natural penicillin but now replaced by newer antibiotics. It is still used to test the drug sensitivity of staphylococci. m.-resistant Staphylococcus aureus see MRSA.

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