n. 乐音学

[ noun ]
the study of musical sound
<noun.cognition>

Harmonics \Har*mon"ics\ (-[i^]ks), 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.