- A sound amplifying device designed for those with reduced hearing. Those with conductive or sensorineural hearing loss can be helped by the amplification and/or clarification of sounds. Hearing aids have a microphone, amplifier, speaker, and volume control. The main types are: air conduction, bone conduction, canal aids, postauricular, body aids, and cochlear implants.
- noun a small electronic device fitted into or near the ear, to improve someone’s hearing by making the sounds louder