Deutsches Wörterbuch
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The Deutsches Wörterbuch (called DWB or "der Grimm") is one of the most important etymological dictionaries of the German language. The title, translated into English, means "German Dictionary".
It was started by the Grimm Brothers in 1838. When the project finally was finished in 1961, the dictionary contains 32 volumes and includes about 350,000 main entries. In 1971 a supplement with references was published.
The Deutsches Wörterbuch contains detailed information about the origin and examples of the usage of German words, both historically and (at the time of writing) modern. The dictionary contains words of all registers and has been the first to include swearwords and other words generally considered crude.