Definition of harmonica noun from the Oxford Advanced Learner's Dictionary

 

harmonica

 noun
noun
BrE BrE//hɑːˈmɒnɪkə//
 
; NAmE NAmE//hɑːrˈmɑːnɪkə//
 
(also British English or North American English, old-fashioned mouth organ) Musical instruments
 
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a small musical instrument that you hold near your mouth and play by blowing or sucking air through it See related entries: Musical instruments Word Origin mid 18th cent.: from Latin, feminine singular or neuter plural of harmonicus ‘musical’ from Greek harmonikos, from harmonia ‘joining, concord’, from harmos ‘joint’.
See the Oxford Advanced American Dictionary entry: harmonica