Lactam definitions

lăk'tăm
A cyclic amide, or any compound containing it, formed by the intramolecular condensation of an amino carboxylic acid.
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Any of a group of organic cyclic compounds containing the NHCO group in the ring, formed by the elimination of water from the amino and carboxyl groups; inner anhydride of an amino acid.
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(organic chemistry) Any of a class of cyclic amides, that are the nitrogen analogs of lactones, formed by heating amino acids; the tautomeric enol forms are known as lactims.
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Origin of lactam

lact(one) am(ide)