Definition of melodium in English:

melodium

Pronunciation /mɪˈləʊdɪəm/

noun

historical Music
  • 1Melodeon.

    Chiefly a British use, melodeon being the more usual term in the United States.

  • 2A monophonic electronic keyboard instrument, developed in Germany in the late 1930s.

Origin

Mid 19th century; earliest use found in The Times.