ble·o·my·cin 
(blē′ə-mīsĭn)
(blē′ə-mīsĭn)n.
Any of a class of antibiotics isolated from the bacterium Streptomyces verticillus, used usually in sulfate form in combination with other drugs to treat certain kinds of cancer.
[Alteration of phleomycin, a related antibiotic : phleo-, of unknown meaning + -MYCIN.]