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



BrE BrE//hɑːˈməʊniəm//
; NAmE NAmE//hɑːrˈmoʊniəm//
Musical instruments
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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. See related entries: Musical instruments Word Originmid 19th cent.: from French, from Latin harmonia ‘joining, concord’ (from Greek, from harmos ‘joint’) or Greek harmonios ‘harmonious’.
See the Oxford Advanced American Dictionary entry: harmonium