rifampin

noun Pharmacology.

1. a semisynthetic broad-spectrum antibiotic, C43H58N4O12, used in the treatment of pulmonary tuberculosis, asymptomatic carriers of meningococcal disease, and leprosy.

n.

1. A semisynthetic antibiotic, derived from a form of rifamycin, that interferes with the synthesis of RNA and is used to treat bacterial and viral diseases.