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- WordNet 3.0
By Princeton University
- English Dictionary Database
By DataStellar Co., Ltd
- A practical medical dictionary.
By Stedman, Thomas Lathrop
- The Concise Standard Dictionary of the English Language
By James Champlin Fernald
- Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.
- Appleton's medical dictionary
By Smith Ely Jelliffe
Word of the day
of a chemical compound having ring with eight members