/ hɑːˈməʊniəm; NAmE hɑːrˈmoʊ-/ noun
a musical instrument like a small organ. Air is forced through metal pipes to produce the sound and the different notes are played on the keyboard.
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WORD ORIGIN
mid 19th cent.: from French , from Latin harmonia joining, concord (from Greek , from harmos joint) or Greek harmonios harmonious.