antibiotic A substance that is biostatic or biocidal at low concentrations towards bacteria, yeasts, moulds, or other form of life, especially pathogenic or noxious organisms. Although the term was originally restricted to substances produced by microorganisms, its use was later expanded to include derivatives of such substances and it is now commonly used to include entirely synthetic compounds. Antibiotika Antibiotikum CHEBI:22582 CiteXplore:12964249 CiteXplore:22117953 CiteXplore:22439833 CiteXplore:22849268 CiteXplore:22849276 CiteXplore:22958833 antibiotic antibiotics antibiotique chebi_ontology toxin antimicrobial agent