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Definition of hearing aid noun from the Oxford Advanced Learner's Dictionary

hearing aid

noun
 
/ˈhɪərɪŋ eɪd/
 
/ˈhɪrɪŋ eɪd/
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  1. a small device that fits inside the ear and makes sounds louder, used by people who cannot hear well
    • to have/wear a hearing aid
    Topics Disabilityc1
See hearing aid in the Oxford Advanced American Dictionary
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