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rifampin

ri·fam·pin [ ri fámpin ] or ri·fam·pi·cin [ ri fámpissin ]


noun 
Definition:
 
antibiotic: a semisynthetic derivative of rifamycin that works by interfering with RNA synthesis in the infecting bacteria Use: treatment of bacterial infections, especially tuberculosis

[Mid-20th century. Blend of rifamycin + piperazine]
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