actinomycin
noun
ac·ti·no·my·cin
ˌak-(ˌ)ti-nō-ˈmī-sᵊn
-tə-nō-;
ak-ˌti-nō-
: any of various red or yellow-red mostly toxic polypeptide antibiotics isolated from soil bacteria (especially Streptomyces antibioticus)
specifically
: one used to inhibit DNA or RNA synthesis
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Merriam-Webster unabridged
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