hearing aid 
noun
A small amplifying device which fits on the ear, worn by a partially deaf person.She did wear a big hearing aid that delivered highly amplified sound to her left ear....
- The device looks like an older hearing aid with a curved battery and electronics holder worn above and behind the ear.
- Each time you come to the church you should switch your hearing aid to the ‘T’ position for better quality sound.
- amatriciana
- a matter of
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- a matter of form
- a matter of life and death
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- amaurosis
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- ambassador extraordinary
- ambassadorial