The Collaborative International Dictionary of English v.0.48:

munj \munj\, munja \munja\n.
   A tough Asiatic grass (Saccharum bengalense syn. Saccharum
   munja) whose culms are used for ropes and baskets.

   Syn: munj, Saccharum bengalense, Saccharum munja.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

munj
    n 1: tough Asiatic grass whose culms are used for ropes and
         baskets [syn: munj, munja, Saccharum bengalense,
         Saccharum munja]