Riff
     n 1: a Berber living in northern Morocco [syn: {Riffian}]
     2: a jazz ostinato; usually provides a background for a solo
        improvisation
     v 1: look through a book or other written material; "He thumbed
          through the report"; "She leafed through the volume"
          [syn: {flick}, {flip}, {thumb}, {riffle}, {leaf}]
     2: play riffs
Source: WordNet® 2.0

RIFF
     Resource Interchange File Format (MS, IBM, MM)
     
     
Source: Virtual Entity of Relevant Acronyms