D defs.my
Entry 1 sense Webster, 1913

Lactam

· Lac·tam · IPA /ˈlækˌtæm/
01 n. One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide.
  1. 1.
    One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide.(Chem.)