noun.
Any of a class of toxicpolypeptideantibiotics found in soilbacteria of genusStreptomyces.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
any of various red antibiotics isolated from soil bacteria
Word Usage
"An enormous molecule shaped like an ancient Greek statue, with a small, headless torso and two extended wings, actinomycin D was later found to work by binding and damaging DNA."