lactim

from The Century Dictionary.

• noun 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.

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

• noun (Chem.) One of a series of anhydrides resembling the lactams, but of an imido type. Cf. lactam.

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

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