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Masking Noise – A sound introduced into an ear system for the purpose of covering up an unwanted sound. Masking noises are used during hearing tests to cover–up unwanted responses from a non–test ear. Tinnitus maskers also utilize a masking noise to cover–up tinnitus.

Mastoid – Hard, bony structure behind the ear.

Mastoid Surgery – Surgical procedure to remove infection from the mastoid bone.

Malleus -The first of the three middle ear bones. It is the bone touching the eardrum. Commonly called the Hammer.

Ménière’s Disease – An inner ear disorder that can affect both hearing and balance and is usually associated with vertigo (feeling like you’re spinning when you’re really not), hearing loss, roaring tinnitus, and the sensation of fullness in the ear.

Meningitis – Inflammation of the meninges, the membranes that envelop the brain and the spinal cord; may cause hearing loss or deafness.

Middle Ear – Part of the ear that includes the eardrum and three tiny bones (ossicles) of the middle ear, ending at the oval window that leads to the inner ear.

Mild Hearing Loss – A hearing loss ranging between 26 and 40 dB.

Mixed Hearing Loss – A hearing loss that has both conductive and sensorineural components.

Motion Sickness – Dizziness, sweating, nausea, vomiting, and generalized discomfort experienced when an individual is in motion.