1 a wasting away of the body, as from poor nutrition, nerve damage, or disuse. 2  to undergo atrophy; wither; degenerate:His crippled leg began to atrophy with no exercise. 3  to become weakened; decline:Industry atrophied in bad economic times.
Voice Amplifiers / Long Range Listening Devices. Listening devices can be utilized for a variety of purposes including listening through a wall, listening from a distance or enjoying your favorite animals in the wild. More complex systems contain an audio transmitter and receiver.
Assistive Listening Devices. Assistive listening devices (ALDs) or assistive listening systems include a large variety of devices designed to help you hear sounds in everyday activities. ALDs are available in some public places such as auditoriums, movie theaters, houses of worship, and meeting rooms.