\Har*mon"ics\, n.
1. The doctrine or science of musical sounds.
2. pl. (Mus.) Secondary and less distinct tones which
   accompany any principal, and apparently simple, tone, as
   the octave, the twelfth, the fifteenth, and the
   seventeenth. The name is also applied to the artificial
   tones produced by a string or column of air, when the
   impulse given to it suffices only to make a part of the
   string or column vibrate; overtones.