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8 Words That Are Older Than You Think

lactam

[lak-tam] /ˈlæk tæm/
noun, Chemistry
1.
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
1880-1885
1880-85; lact(one) + am(ide)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for lactam
  • Beta-lactam antibiotics include penicillins, cephalosporins, and some newer medications.
  • These drugs get their name from the beta-lactam ring, the circular chemical structure that forms their business end.
British Dictionary definitions for lactam

lactam

/ˈlæktæm/
noun
1.
(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')
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.
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