This contribution describes a new tool (named VisDic) for browsing and editing WordNet databases. It was developed in the Natural Language Processing Laboratory at the Faculty of Informatics, Masaryk University. In fact, it is not designed as a specialized tool for processing WordNet data only, generally, it has been developed as a tool for viewing and editing any lexical database as e.g. multilingual dictionaries, monolingual dictionaries, corpora, etc. From this point of view, WordNet can be also understood as a dictionary with special features.