Source : Webster's Revised Unabridged Dictionary (1913)

Aphonia \A*pho"ni*a\, Aphony \Aph"o*ny\, n. [NL. aphonia, Gr. ?,
   fr. ? voiceless; 'a priv. + ? voice: cf. F. aphonie.] (Med.)
   Loss of voice or vocal utterance.

Source : WordNet®

aphonia
     n : a disorder of the vocal organs that results in the loss of
         voice [syn: {voicelessness}]