theremin

/ˈθɛ.ɹɨ.mɪn/

IPA: /T ER0 IY1 M IH0 N/

noun
  1. 1

    An electronic musical instrument that generates sound of varying pitch and volume depending on the proximity of the musician’s hands to two antennae mounted on the instrument.

Source: https://en.wiktionary.org/wiki/theremin