Webster's Revised Unabridged Dictionary · 1913

Hindoostanee

Hindoostanee , adjective

[Hind. Hindūstānī an Indian, from Hind. and Per. Hindūstān India.]

Of or pertaining to the Hindoos or their language.
The language of Hindustan; the name given by Europeans to the most generally spoken of the modern Aryan languages of India. It is Hindi with the addition of Persian and Arabic words.

Also: Hindustani, Hindoostani