Webster's English Dictionary

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riff

1. riff \'rif\ vb [short for riffle] : RIFFLE, SKIM {~ pages} 
2. riff n [prob. by shortening & alter. fr. refrain] : an ostinato phrase 
   in jazz typically supporting a solo improvisation 
3. riff vi : to perform a jazz riff Riff \'rif\ \'rif-e-\ \'rif-e--*n\ n or 
   Riffs or Riffi or Riff [Ar Rif] pl  : a Berber of the Rif in northern 
   Morocco