The Collaborative International Dictionary
Lactim
Lactim \Lac"tim\, n. [Lactic + imido.] (Chem.) One of a series of anhydrides resembling the lactams, but of an imido type; as, isatine is a lactim. Cf. Lactam.
Wiktionary
lactim
n. (context organic chemistry English) Any of a class of cyclic hydroxy-imides (enols) that are tautomeric with the lactams.