noun
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
noun
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
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005