ōⁿdmu̅e̅zēkȧl noun
or ondes martenot ōⁿdmȧrtənō
( plural ondes musicales like sing ; or ondes martenot like sing )
Usage: often capitalized O&M
Etymology: ondes musicales from French, literally, musical waves; ondes martenot from French, literally, Martenot waves, after Maurice Martenot b 1898 French musician, its inventor
: a melodic electrophone capable of producing quarter tones and eighth tones