DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   harmonica
       n 1: a small rectangular free-reed instrument having a row of
            free reeds set back in air holes and played by blowing into
            the desired hole [syn: harmonica, mouth organ, harp,
            mouth harp]