This dictionary of present-day German comprises some 11,000 pages and 80,000 headwords and is the first comprehensive research-based dictionary of German word families. It orders the vocabulary by stem-morphemes, presents all the derivations with their individual meanings, gives a morphological structural formula for each derivation and lists the most important specialist literature. Thus the dictionary manages to overcome the usual atomised presentation when words are given in alphabetical order, which does not take account of the reality of the language and its processes of word formation. The dictionary is a standard lexicographical work for language researchers and language historians.