Deutsches Wörterbuch
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The Deutsches Wörterbuch is one of the most important etymological dictionaries of the German language. The title, literally translated to 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.