aphonia

n. voice loss caused by a disease of the larynx

Aphonia is the medical term for the inability to speak. It is considered more severe than dysphonia. A primary cause of aphonia is bilateral disruption of the recurrent laryngeal nerve, which supplies nearly all the muscles in the larynx. Damage to the nerve may be the result of surgery (e.g., thyroidectomy) or a tumor.
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Aphonia /apho·nia/ loss of voice; inability to produce vocal sounds. a·pho·ni·a n. Loss of the voice resulting from disease, injury to the vocal [more]Aphonia - Community and Resources

Noun
1. a disorder of the vocal organs that results in the loss of voice
(synonym) voicelessness
(hypernym) speech disorder, speech defect, defect of speech

(n.)
Alt. of Aphony