English version

hearing aid

From Longman Dictionary of Contemporary Englishhearing aidˈhearing aid noun [countable]  MHa small object which fits into or behind your ear to make sounds louder, worn by people who cannot hear well
Examples from the Corpus
hearing aidI realized for the millionth time that she was too proud to wear a hearing aid in her dead ear.Some venues have an induction loop fitted to assist hearing aid users.Headphones are not practicable for hearing aid wearers because the proximity of the headphone causes acoustic feedback in the aids.Glover hesitated and then refrained from adjusting his hearing aid.An old-fashioned kind of hearing aid was called an ear trumpet.
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