hearing aid

noun

1. a compact electronic amplifier worn to improve one’s hearing, usually placed in or behind the ear.

noun

1. a device for assisting the hearing of partially deaf people, typically consisting of a small battery-powered electronic amplifier with microphone and earphone, worn by a deaf person in or behind the ear

n.

1. A small electronic apparatus that amplifies sound and is worn in or behind the ear to compensate for impaired hearing.