D defs.my
Entry 1 sense Webster, 1913

Overtone

/ōv'-ẽrt-ōnˌ/ · O·ver·tone · IPA /ˈoʊvɚtoʊn/
01 n. One of the harmonics faintly heard with and at a higher frequency than a fundamental tone as it dies away, produced by some aliquot portion…
  1. 1.
    One of the harmonics faintly heard with and at a higher frequency than a fundamental tone as it dies away, produced by some aliquot portion of the vibrating sting or column of air which yields the fundamental tone; one of the natural harmonic scale of tones, as the octave, twelfth, fifteenth, etc.; an aliquot or “partial” tone; a harmonic. See Harmonic, and Tone.(Mus.) See: Harmonic, Tone