Turkish language was under the dominance of Arabian and Persian languages during the Seljukian period in Anatolia. Turkish gained importance at the period of the small Turcomen states, founded after the great Seljukian State had fallen this period some books were written with the countenance of the statesmen, and about thirty of this books were on medicine. These books were written in plain Turkish, and they are important regarding the Turkish language, because of the Turkish medical terms, besides medical knowledge. The development of Turkish in these books and examples of medical terms are given in this study.