mitomycin

[mī′tə-mīsĭn]
n.
  1. Any of a group of antibiotics produced by the soil actinomycete Streptomyces caespitosus that inhibit DNA synthesis and are used against bacteria and cancerous tumor cells.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.