Noun
ondes martenot (plural ondes martenot)
(music) An early electric keyboard instrument.
Synonym: ondes musicales
Coordinate term: theremin
ondes Martenot (plural ondes Martenot)
Alternative letter-case form of ondes martenot
Maurice Martenot invented the Ondes Martenot in 1928, and soon demonstrated it in Paris. Source: Internet