hearing aid
US /ˈhɪrɪŋ eɪd/
UK /ˈhɪrɪŋ eɪd/

1.
a small device that fits in or on the ear, used by partially deaf people to amplify sound
:
•
My grandmother uses a hearing aid to hear better.
•
He had his hearing aid adjusted by an audiologist.
a small device that fits in or on the ear, used by partially deaf people to amplify sound