Ottoman Turkish

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The form of the Turkish language used as the administrative and literary language of the Ottoman Empire, containing extensive borrowings from Arabic and Persian and written in Arabic script.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun The variety of the Turkish language that was used as the administrative and literary language of the Ottoman Empire.
• adjective Of, from, or pertaining to Ottoman Empire, the Ottomans or the Ottoman Turkish language.