Noun
an electronic device that amplifies sound and is worn to compensate for poor hearing
a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person
Source: WordNetTurn up your hearing aid 'Grandpa', because I'm only going to say this once! Stephen Colbert
A bone-anchored hearing aid could, in this situation, be a good option. Source: Internet
After delivering his position, Inönü turned off his hearing aid during the speeches of British foreign secretary Lord Curzon. Source: Internet
As he was being tested and fitted, then re-tested again with his hearing aid, the eight-year-old was no doubt unaware that the First Lady of Guyana, Mrs. Sandra Granger, stood behind him observing every move. Source: Internet
A hearing aid usually consists of a microphone, amplifier, and receiver. Source: Internet
E.g., the quantities 1 mW and 1 MW represent two different quantities; the former is the typical power requirement of a hearing aid (1 milliwatt or 0.001 watts), and the latter the typical power requirement of a suburban train (1 megawatt or main watts). Source: Internet