The result of more than three decades of dedicated scholarly research by the Forschungsstelle Gregor von Nyssa (Münster), the Lexicon Gregorianum constitutes the most comprehensive Greek-German dictionary ever of the language used by Gregory of Nyssa. It is, and will be for the foreseeable future, the only dictionary available specifically addressing the vocabulary of late Classical Greek. Far from being a simple word list this seminal reference work documents Gregory's complete vocabulary, taking account of the syntax, meaning, and connotations of every occurrence of a key word in his writings. "Band IV" includes the articles of the letters ζ to ι and deals amongst other important terms with the most significant theological words, for example with the articles of ζωή, άνατος and εός.