Definition of Koran noun from the Oxford Advanced American Dictionary

Koran

noun (also Qur'an)
/kəˈrɑn; kəˈræn/
 
the Koran [singular]
 
the holy book of the Islamic religion, written in Arabic, containing the word of Allah as revealed to the Prophet Muhammad
Koranic
/kəˈrænɪk; kəˈrɑnɪk/
 
adjective