the quality of a sound (especially a musical sound) due to its overtones, especially that which is distinctive to the tone of a particular musical instrument or singing voice;
e.g. Her voice attained its superior timbre through extensive training.
(noun)
the characteristic resonance of a sound that aids the ear in identifying or recognizing it, especially in the case of a voiced/spoken speech sound;
e.g. I would recognize the timbre of his voice anywhere.