The Collaborative International Dictionary of English v.0.48:

Bhang \Bhang\, n. [Per. bang; cf. Skr. bhang[=a] hemp.]
   An astringent and narcotic drug made from the dried leaves
   and seed capsules of wild hemp (Cannabis Indica), and
   chewed or smoked in the East as a means of intoxication. See
   Hasheesh.
   [1913 Webster] Bheesty

WordNet (r) 3.0 (2006):

bhang
    n 1: a preparation of the leaves and flowers of the hemp plant;
         much used in India