beta-lactamWiktionary 原文英美构词拆解beta词干+lactam词干词源说明From beta + lactam, where beta refers to the position of the carbon atom to which the nitrogen is attached.释义名词noun1(organic chemistry) A lactam having a four-membered ring structure; a structural element of many antibiotics such as penicillin.同族词派生词 3monobactam·beta-lactamase·