actinomycin D
actinomycin D , noun
[From actinomyces, the genus of the organism in which they were first found.]
The most well-known of the actinomycins (C62H86N12O16), a class of antibiotics which act by binding to DNA and inhibiting synthesis of RNA; they act against gram-positive bacteria and many eukaryotic organisma. Actinomycin D has been used in human medicine to treat certain tumors.