The Collaborative International Dictionary of English v.0.48:
Vox \Vox\, n. [L. See Voice.] A voice. [1913 Webster] Vox humana[L., human voice] (Mus.), a reed stop in an organ, made to imitate the human voice. [1913 Webster]WordNet (r) 3.0 (2006):
vox humana n 1: an organ reed stop producing tones imitative of the human voice