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

picture of a harmonica

harmonica

noun

harmonica pronunciation English

hɑːˈmɒnɪkə harmonica pronunciation American

harmonica pronunciation American

hɑːrˈmɑːnɪkə

(British English also mouth organ)

a small musical instrument that you hold near your mouth and play by blowing or sucking air through it