The manuscript of Turin, Biblioteca Nazionale Universitaria, A. II. 12, includes (on folios 213r–217v) a short Hebrew dictionary of 39 philosophical terms. 23 of these terms can be found in the introduction to part two of Maimonides' Guide of the Perplexed, which has been copied in full lenght in the manuscript as well (according to Samuel Ibn Tibbon's Hebrew translation). The dictionary was probably written in the second half of the 13th century by an anonymous scribe and has been unknown to scholars until now. This article offers a critical edition of the original text of the dictionary, with a facsimile reproduction of the relevant folios as well as an English annotated summary of its content.