Harmonics
HARMON'ICS,noun Harmonious sounds; consonances.
1. The doctrine or science of musical sounds.
2. Derivative sounds, generated with predominant sounds, and produced by subordinate vibrations of a chord or string, when its whole length vibrates. These shorter vibrations produce more acute sounds, and are called acute harmonics
3. Grave harmonics are low sounds which accompany every perfect consonance of two sounds.