from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a class of cyclic hydroxy-imides (enols) that are tautomeric with the lactams.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of a series of anhydrides resembling the lactams, but of an imido type. Cf. lactam.

from The Century Dictionary and Cyclopedia

  • n. The name of a class of organic compounds containing the group -C(OH):N-. It is a tautomeric and, occasionally, isomeric form of the lactam radical.


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