from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a group of antibiotics originally isolated from a strain of the soil microorganism Streptomyces mediterranei, used in the treatment of leprosy, tuberculosis, and other bacterial diseases.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of a group of antibiotics, a subclass of the ansamycins, which are synthesized either naturally by the bacterium Amycolatopsis mediterranei or artificially.
Alteration of rifomycin : probably Italian rifo(rmare), to reform (ri-, again, from Latin re-; see re- + formare, to form from Latin fōrmāre; see reform) + -mycin.(American Heritage® Dictionary of the English Language, Fourth Edition)