aphonia (n.)

in pathology, "want of voice, loss of voice through some physical condition," 1778, from medical Latin aphonia, from Greek aphonia "speechlessness," abstract noun from aphonos "voiceless," from a- "not, without" (see a- (3)) + phone "voice," from PIE root *bha- (2) "to speak, tell, say" + abstract noun ending (see -ia). Englished form aphony is attested from 1680s.