Dictionary Definition :
Definition[1]
:
Khusta, "a district of ancient Tukhara, probably the region south of Talikhan, Lat. 36°42 N., Long. 69°25 E." Eitel. But it may be Khost in Afghanistan, south-west of Peshawar.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous