See Food and Drug Administration.

A high-pitched whistle or squeal that’s made when an amplified sound is picked up by a microphone and re-amplified. For example, it occurs when the sound coming out of a hearing aid leaks out of the ear canal, gets back into the hearing aid’s microphone and is amplified over and over until all it does […]

May be caused by a physical condition—e.g. fluid in the middle ear, or by Meniere’s disease, or it may be a psychological feeling—the result of rapidly losing some of your hearing. When this happens, your brain thinks that your ear must be “stuffed” or “blocked” or else you’d hear normally, wouldn’t you—hence the feeling of fullness.

The name of the sound processing strategy (software) for the Harmony and Platinum cochlear implant sound processors. It works with the HiRes 90K and CII implants from Advanced Bionics.

Acoustically, a device that allows the passage of certain frequencies and attenuates others.

Using hand-shapes to represent the letters of the alphabet in order to spell out words. Fingerspelling is a part of all signed languages, including American Sign Language.