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
Origin of lactamlact(one) + am(ino)
A cyclic amide, or any compound containing it, formed by the intramolecular condensation of an amino carboxylic acid.
Origin of lactamlact(one) am(ide)
Greek prefixes indicate the ring size e.g. α- 3-membered, β- 4-membered.