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2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - New Age Dictionary Database
By Oddity Software
 
1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1899 - The american dictionary of the english language.
By Daniel Lyons
 
1871 - The Cabinet Dictionary of the English Language

Word of the day

beta Lactams

  • Cyclic amides formed aminocarboxy acids by the elimination water. They isomeric with lactims, which are enol forms of lactams. (From Dorland, 27th ed)
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