penicillin-resistant

The term is a modern scientific compound, directly combining two established English words to create a precise medical descriptor. 'Penicillin' itself originates from the Latin 'Penicillium', the name for the mold genus from which the antibiotic was first derived, with the '-in' suffix typical for chemical substances. 'Resistant' comes from Latin 'resistere', meaning "to take a stand against, oppose," composed of 're-' (back, against) and 'sistere' (to stand). The compound's logic is transparently literal: describing a microorganism that "stands against" or "withstands" the effects of penicillin.

Structure: penicillin (antibiotic) + resistant (impervious) - penicillin: A modern English word formed from the Latin 'Penicillium' (a genus of mold) + the chemical suffix '-in'. It functions as the specific object of resistance. - resistant: From the Latin verb 'resistere' (to stand back, oppose), via French. The suffix '-ant' indicates an adjective meaning "characterized by that action." It functions as the core descriptive element meaning "able to withstand."