zhǔ​yīn

tonic

主音 zhǔ​yīn
tonic noun
The first note of a musical scale or the keynote of a piece of music.
vowel noun
The principal vocalic sound or nuclear vowel in a syllable or diphthong.

Frequency

Movie subtitles
0.720 per million appears in 0% of films
Written text
0.253 per million

Sources

Definitions
CC-CEDICT