Hearing Aid

n. electronic amplifying device worn in or behind the ear and used by people who are hard of hearing

A hearing aid is an instrument that brings sound more effectively to the listener's ear, helping hearing impaired people hear sounds better. Early devices were passive, and attempted to gather sound energy and direct it to the ear. A funnel-like amplification cone called an "ear trumpet" or "ear horn" was one of the first such devices.
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Hearing aid n. A small electronic apparatus that amplifies sound and is worn in or behind the ear to compensate for impaired hearing. [more]Hearing aid - Community and Resources

Noun
1. an electronic device that amplifies sound and is worn to compensate for poor hearing
(synonym) deaf-aid
(hypernym) electronic device
2. a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person
(synonym) ear trumpet
(hypernym) acoustic device

hearing-aid /'hiəriɳ'eid/
danh từ ống nghe (của người điếc)
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