Answer
Modern sense: In the 1940s, Selman Waksman introduced the term "antibiotics" in its modern sense, referring to antimicrobial substances produced by microorganisms. This term replaced the earlier term "antibiosis," which had been used to describe the antagonistic interactions between microorganisms. Waksman's work on antibiotics, particularly streptomycin, revolutionized the treatment of bacterial infections and paved the way for the development of numerous life-saving drugs.