Medieval Persian-Ottoman Turkish bilingual dictionaries (farhangs) were created as cultural and educational tools and were educational, instructive, and translating types of works. These dictionaries were special tools in the medieval educational system with which not only the Persian language was taught, but also the Persian and Arabic loan vocabulary in Turkish. Primarily, the medieval bilingual dictionaries aimed to help users read and understand the patterns of Persian classical literature, but they also assisted in teaching Persian grammatical categories that are relevant for the grammar of Ottoman Turkish. The examination of the medieval bilingual dictionaries kept in the Matenadaran support this theory.