/ hɑːˈmɒnɪkə; NAmE hɑːrˈmɑːn-/ ( BrE also ˈmouth organ ) noun
a small musical instrument that you hold near your mouth and play by blowing or sucking air through it
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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.