hearing aid
noun1
A device used to help the hard of hearing to hear sounds.
- Sadly, the ever-eager Reverend Judith had not been able to conjure up many worshippers, even though it was Father’s Day. There was just one old dear sitting halfway back, her faulty hearing aid letting off a high-pitched whistle.2017, David Walliams [pseudonym; David Edward Williams], Bad Dad, London: HarperCollins Children’s Books, →ISBN: