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Captioning – Text display of spoken words, presented on a television or a movie screen, that allows deaf or hard–of–hearing viewers to follow the dialogue and the action of a program simultaneously.

Cerumen (Ear Wax) – Yellow secretion from glands in the outer ear canal that keeps the skin of the ear canal dry and protected from infection.

Ceruminosis– Increased or excessive ear wax build-up.

Cholesteatoma – An abnormal accumulation and pocketing of dead cells in the eardrum, which can often be surgically repaired.

Cilia – Tiny hairs within the cochlea

Cochlea – Snail – shaped structure in the inner ear that contains the organ of hearing.

Cochlear Implant – Medical device that bypasses damaged structures in the inner ear and indirectly stimulates the auditory nerve, allowing some deaf and hard of hearing individuals to learn to hear and interpret sounds and speech. Learn more about cochlear implants.

Cognition – Thinking skills that include perception, memory, awareness, reasoning, judgment, intellect, and imagination.

Completely–In–The–Canal Hearing Aid/CIC Hearing Aid – A hearing aid that is designed so that most of the electronics are located in the ear canal. The smallest style of hearing aid currently available.

Conductive Hearing Loss – Hearing loss caused by an abnormal transmission of sound in the outer or middle ear. Most common in children.

Congenital Hearing Loss – The presence of hearing loss at or before birth.