ondes martenot

 
Pronunciation: /ɒ̃d ˈmɑːt(ə)nəʊ, ɔ̃d maʀtəno/

noun (plural )

Music
  • an electronic keyboard producing one note of variable pitch.

Origin:

1950s: from French ondes musicales, literally 'musical waves' (the original name of the instrument) and the name of Maurice Martenot (1898–1980), its French inventor