melodium|mɪˈləʊdɪəm| [A quasi-L. formation on melody.] = melodeon 1. 1847Illustr.Lond. News 7 Aug. 95/2 Pianos, melodiums, harmoniums, eolinas, &c., too dear at any price.1878Grove Dict.Mus. I. 61 The instruments first made in America were known as ‘Melodeons’, or ‘Melodiums’.