a·pho·ni·a 
(ā-fōnē-ə)
(ā-fōnē-ə)n.
Loss of the voice resulting from disease, injury to the vocal cords, or various psychological causes, such as hysteria.
[New Latin aphōnia, from Greek aphōniā, speechlessness, from aphōnos, voiceless : a-, without; see A-1 + phōnē, voice; see bhā-2 in the Appendix of Indo-European roots.]
a·phonic (ā-fŏnĭk, ā-fōnĭk) adj.