noun
aphonia; loss of voice
Medical term for the inability to produce voiced sound, often due to physical or psychological causes.
失声症の治療には音声療法が用いられることがある。
Voice therapy is sometimes used to treat aphonia.
失語症 (aphasia) is a language disorder affecting speech production or comprehension, while 失声症 is specifically the loss of voice.
From 失 (loss) + 声 (voice) + 症 (condition/syndrome). A modern medical compound.