lactam /lac·tam/ (lak´tam) a cyclic amide formed from aminocarboxylic acids by elimination of water; lactams are isomeric with lactims, which are enol forms of lactams. 
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β-lactam see under antibiotic.
| beta-lactam n. Any of a class of broad-spectrum antibiotics that are structurally and pharmacologically related to the penicillins and cephalosporins. |
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