This paper introduces a new lexicographic resource, the MuLeXFoR database, which aims to present word-formation processes in a multilingual environment. Morphological items represent a real challenge for lexicography, especially for the development of multilingual tools. The database introduced in this paper tries to take advantage of recent advances in electronic implementation and morphological theory. Word-formation is presented as a set of multilingual rules that users can access via different indexes (affixes, rules and constructed words). MuLeXFoR entries contain, among other things, detailed descriptions of morphological constraints and productivity notes, which are sorely lacking in currently available tools such as bilingual dictionaries.