partial tone

In acoustics, a "partial tone," also known as a "partial," refers to any of the individual wave forms that make up a complex musical tone. Most musical tones are not pure; they consist of a fundamental vibration and additional partial wave forms. These partials have harmonic relationships to the fundamental, often expressible as frequency ratios like 1:2, 3:4, and so on.12

These partials are also known as overtones and contribute to the unique timbre or tone quality of an instrument. While the ear typically perceives these as a single, rich tone, they are distinct components that differentiate sounds, even when playing the same pitch. The ear acts as a spectrum analyzer, processing these complex waves into electrical impulses that describe sound intensity as a function of frequency.23