  Another important source of Ibn Tibbon’s translations is the Arabic translation of the Bible by Saadia Gaon. This presented a ready lexicon of sorts for the translator: he could identify the Arabic term in Saadia’s Tafsir and replace it with the biblical term it translated. One example of Ibn Tibbon doing exactly this is found in his glossary, in his discussion of the terms “definition” and “description.” His discussion, as found in the manuscript versions (see Perush ha-Millot ha-Zarot, ed. Even-Shemuel, pp. 24-5, corrected by Hebrew MS London 904, 161b), is as follows: