Lactam n. : One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol.

Example:
Beta Lactam/Beta-Lactamase Inhibitor-Can someone explain it to me in a simple way?

Taxonomy
lactam antibiotic, Lactams, free encyclopedia, carbon atoms, carbonyl, Reactions, catalyzed, search, left to right, Prefixes, moiety, 4 and 6, alphabetical order, the Greek alphabet, cyclic ester, synthetic methods, oximes, ketones.

Defination from the web:
... β-lactam (2 carbon atoms outside the carbonyl, 4 ring atoms in total), γ-lactam (3 and 5), δ-lactam (4 ... β-lactam with a four-membered ring found in beta-lactam antibiotics. Penicillin, considered the most famous antibiotic, is a β-lactam antibiotic. Lactone, a cyclic ester. ...