from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A cyclic amide, or any compound containing it, formed by the intramolecular condensation of an amino carboxylic acid.

from The Century Dictionary.

  • noun The name of a class of organic compounds containing the group or They are formed by the elimination of water from γ-or δ-amino acids respectively, the reaction being characteristic of these two classes of compounds. They are simple cyclicacid amides.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide.
  • noun [informal, laboratory slang] an antibiotic containing a beta-lactam, such as a penicillin, cephalosporin, or carbapenem; also called a beta-lactam antibiotic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun 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.


from The American Heritage® Dictionary of the English Language, 4th Edition

[lact(one) + am(ide).]



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