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From The Collaborative International Dictionary of English v.0.48:
Overtone \O"ver*tone`\, n. [A translation of G. oberton. See Over, Tone.] (Mus.) 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. --Tyndall. [1913 Webster]