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rifamycin

rif·a·my·cin [ rìffə mss'n ]


noun 
Definition:
 
antibiotic: an antibiotic belonging to a group originally isolated from the soil bacterium Streptomyces mediterranei. Use: treatment of leprosy, tuberculosis, other bacterial infections.

[Mid-20th century. Probably < Italian riformare "to reform" < formare "to form" < Latin (see reform)]
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