noun Pharmacology.
- any of a group of related antibiotics derived from several species of streptomyces bacteria, used against susceptible bacteria and fungi and in the treatment of various cancers.
noun
- any of several toxic antibiotics obtained from bacteria of the genus Streptomyces, used in treating some cancers; the most commonly used is dactinomycin (actinomycin D)
n.
- Any of a large group of red, often toxic, polypeptide antibiotics isolated from soil bacteria of several species of Streptomyces (originally Actinomyces) that are active against gram-positive bacteria and fungi.