lactam

[ lak-tam ]
/ ˈlæk tæm /

noun Chemistry.

any of a group of cyclic amides characterized by the NHCO group, derived from aminocarboxylic acids by the intramolecular elimination of water from the amino and carboxylic groups.

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Origin of lactam

First recorded in 1880–85; lact(one) + am(ide)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for lactam

lactam
/ (ˈlæktæm) /

noun

chem any of a group of inner amides, derived from amino acids, having the characteristic group -CONH-

Word Origin for lactam

C20: from lact (one) + am (ide)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for lactam

lactam
[ lăktăm′ ]

n.

An amide formed from amino carboxylic acids containing a keto group in a ring configuration, as seen in purines, pyrimidines, and antibiotics. It is tautomeric to lactim.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.