<p><strong>Noun</strong></p><ul><li>Pharmacology: A dull-yellow, crystalline antibiotic powder, C₂₂H₂₄N₂O₉, produced by <em>Streptomyces rimosus</em>, used chiefly in treating infections caused by streptococci, staphylococci, Gram-negative bacilli, rickettsiae, and certain protozoans and viruses.</li></ul>