The Collaborative International Dictionary of English v.0.48:

nauch \nauch\ n.
   an intricate traditional dance in India performed by
   professional dancing girls.

   Syn: nautch, nautch dance.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

nauch
    n 1: an intricate traditional dance in India performed by
         professional dancing girls [syn: nautch, nauch, nautch
         dance]