A hearing aid is a small device that makes sounds louder. Fit a hearing aid.
A good one lifts speech rather than everything, which is the difficult part. A hearing aid takes weeks to get used to, since the brain must relearn what to ignore.
1nounhearing aidA small device that makes sounds louder.
“The hearing aid whistled every time he put his hat on.”
hearing aid is a device.
Practised in Disability & Access