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Definition of Hearing aid
1. Noun. An electronic device that amplifies sound and is worn to compensate for poor hearing.
2. Noun. A conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person.
Medical Definition of Hearing aid
1. An electronic amplifying device designed to bring sound more effectively into the ear; it consists of a microphone, amplifier, and receiver. (05 Mar 2000)