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• n  a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections

• The drug, named terramycin (earth mold) by its Brooklyn discoverers, is secreted by a tiny organism, Streptomyces rimosus, of the same group which has produced three other major .
• A "broad band" antibiotic, terramycin attacks 55 diseases.
• This proved impractical; it took too much terramycin.

• oxytetracycline
• hydroxytetracycline
• oxytetracycline hydrochloride
• Terramycin