n. [ Lactone + amido. ] (Chem.) One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide. [ 1913 Webster ]
beta-lactamor β-lactam, (a)a lactam in which the amide bond is contained within a four-membered ring, which includes the amide nitrogen and the carbonyl carbon.(b)an antibiotic containing a beta-lactam, such as a penicillin, cephalosporin, or carbapenem; also called a beta-lactam antibiotic. [ informal, laboratory slang ] [ PJC ]
n. [ Lactic + amide. ] (Chem.) An acid amide derived from lactic acid, and obtained as a white crystalline substance having a neutral reaction. It is metameric with alanine. [ 1913 Webster ]
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