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loss of voice, especially due to an organic or functional disturbance of the vocal organs.
Historical Examples

In these cases there is marked stridor both on inspiration and expiration, but no aphonia.
Manual of Surgery Volume Second: Extremities–Head–Neck. Sixth Edition. Alexander Miles

Both wounds gradually healed; but aphonia—the voice being reduced to a whisper—existed when the man left the regimental hospital.
A Treatise on Gunshot Wounds Thomas Longmore

aphonia is often complete, deglutition impossible, respiration difficult.
A System of Practical Medicine by American Authors, Vol. I Various

The same may be said of feigned insanity, aphonia, deaf-mutism, and loss of memory.
Aids to Forensic Medicine and Toxicology W. G. Aitchison Robertson

There is no aphonia, a sign so typical of adult and of infantile beriberi, although at times the voice is abnormal and whining.
Scurvy Past and Present Alfred Fabian Hess

Each time on her disappearance he had an attack of aphonia, inability to utter a sound of any kind.
Psychotherapy James J. Walsh

If the recurrent laryngeal nerve be compressed, there will be dysphonia or aphonia.
A System of Practical Medicine By American Authors, Vol. II Various

It would cheer me considerably to learn that gobblers occasionally suffer from aphonia or speechlessness.
The Red Cow and Her Friends Peter McArthur

If aphonia and difficulty of both inspiration and expiration be present at the same time, there is certainly membranous occlusion.
A System of Practical Medicine by American Authors, Vol. I Various

noun
loss of the voice caused by damage to the vocal tract
n.

“want of voice, loss of voice, having no sound,” 1719, from Modern Latin aphonia, from Greek aphonia “speechlessness,” noun of quality from aphonos “voiceless,” from a-, privative prefix (see a- (3)), + phone “voice” (see fame (n.)). Less-common anglicized form aphony is attested from 1827.

aphonia a·pho·ni·a (ā-fō’nē-ə)
n.
Loss of the voice resulting from disease, injury to the vocal cords, or psychological causes, such as hysteria.
a·phon’ic (ā-fŏn’ĭk, ā-fō’nĭk) adj.