Hindustani
Concise Oxford English Dictionary © 2008 Oxford University Press:
Hindustani /ˌhɪndʊˈstɑːni/
▶noun a group of mutually intelligible languages and dialects spoken in NW India, principally Hindi and Urdu.
■ the Delhi dialect of Hindi, widely used throughout India as a lingua franca.
▶adjective relating to the culture of NW India.'Hindustani' also found in these Oxford entries:

