Source : WordNet®

Riff
     n 1: a Berber living in northern Morocco [syn: {Riffian}]
     2: a jazz ostinato; usually provides a background for a solo
        improvisation

Source : Free On-Line Dictionary of Computing

RIFF
     
         {Microsoft}'s equivalent to the {Amiga}'s {IFF}
        files format.  RIFF is used for {WAV} and {AVI} files.
     
        (1995-04-21)