The abbreviation for Hertz. (See Hertz).

See Individuals with Disabilities Education Act.

Having an unknown cause. If the doctors don’t know what caused your hearing loss, they say you have idiopathic hearing loss.

See Individualized Education Program.

Testing to measure the ability of the middle ear to conduct sound to the inner ear.

A physical measurement of a sound reflected off the eardrum and analyzed to reveal characteristics of the middle ear. (See also Tympanometry and Tympanogram.)