lactam

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lac·tam

 (lăk′tăm)
n.
A cyclic amide, or any compound containing it, formed by the intramolecular condensation of an amino carboxylic acid.

lactam

(ˈlæktæm)
n
(Elements & Compounds) chem any of a group of inner amides, derived from amino acids, having the characteristic group -CONH-
[C20: from lact(one) + am(ide)]

lac•tam

(ˈlæk tæm)

n.
any of a group of cyclic amides characterized by the NHCO group.
[1880–85; lact (one) + am (ide)]