timbre

1. N-COUNT The timbre of someone's voice or of a musical instrument is the particular quality of sound that it has. 音色; 音质[技术] [usu sing, oft N 'of' n]

His voice had a deep timbre. 他的嗓音深沉。

The timbre of the violin is far richer than that of the mouth organ. 小提琴的音色比口琴的音色丰富得多。