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[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.
Origin of lactam
First recorded in 1880-85; lact(one) + am(ide) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for lactam


(chem) any of a group of inner amides, derived from amino acids, having the characteristic group -CONH-
Word Origin
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
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lactam in Medicine

lactam lac·tam (lāk'tām')
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.
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