n. 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.
the GNU version of the Collaborative International Dictionary of English
n. One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide.
The Century Dictionary and Cyclopedia
n. 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.
Word Usage
"Lactacystin is a cyclic amide, which is also known as a lactam."