This lexicon, a preliminary publication of a project dealing with Arabic dialects in the Chad-Sudan area, has been compiled from four earlier lexicons: G. Trenga, "Le bura-maband du Ouadai"; H. Carbou, "Methode pratique pour l'etude de l'arabe parle au Ouaday et a l'Est du Tchad"; G.L. Lethem, "Colloquial Arabic, Shua Dialect of Bornu, Nigeria and of the Region of Lake Tchad"; and S. Hillelson, "Sudan Arabic: An English-Arabic Vocabulary." It contains all the words as presented in these lexicons together with any etymological information given by the authors. Because these earlier works were designed primarily for British and French administrators and other overseas personnel, entries were listed alphabetically according to their English or French equivalents. The present lexicon, however, lists words according to their Arabic roots, thus facilitating use by linguists interested in Arabic as well as by Arabic speakers in general. Words are glossed in French or English depending on the lexicon from which they have been taken; notes and the introductory section are in French. Problems of listing arising from the presence in these dialects of large numbers of words derived from African languages are discussed in the notes at the beginning of the lexicon, where a key to the transcription is provided as well. (FWB)