What does eardrum mean?
The eardrum, known medically as the tympanic membrane, is a thin, cone-shaped membrane that separates the external ear canal from the middle ear. When sound waves travel down the ear canal, they strike the eardrum and cause it to vibrate; these vibrations are then passed to three tiny bones, the ossicles, which carry them into the inner ear for processing. The word is a transparent compound of "ear" and "drum," reflecting the membrane's drum-like role in receiving vibrations. In everyday usage, "eardrum" appears most often in medical or practical contexts: infections can cause fluid to build up behind it, sudden pressure changes can make it feel strained, and loud noises or inserted objects can rupture it, sometimes requiring surgical repair. Its formal counterpart, "tympanic membrane," belongs chiefly to clinical and anatomical writing. The word carries no strong connotations beyond this medical register and remains universally understood across English-speaking regions.
nounThe thin, oval membrane separating the outer ear from the middle ear, which vibrates in response to sound waves and transmits these vibrations to the tiny bones of the middle ear.
- The tympanic membrane of the ear that vibrates in response to sound and transmits vibrations to the ossicles of the middle ear.
"The explosion left him with a perforated eardrum and temporary hearing loss."
"The doctor examined her ear with an otoscope to check whether the eardrum was intact."
"A sudden change in cabin pressure during the flight made his ears pop as his eardrums adjusted."
The plural refers either to both eardrums of one person or animal, or to the eardrums of multiple individuals.
"Divers must equalize pressure carefully to protect their eardrums at depth."
Your eardrum is thinner than a sheet of paper — yet it can detect vibrations smaller than the diameter of a hydrogen atom.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of eardrum
The word "eardrum" is formed from two native Old English roots: "ear," from Old English "ēare," and "drum," from Middle English "drome," itself likely of imitative origin. The compound emerged in the early modern period, by around the seventeenth century, as English speakers sought a vivid everyday name for the tympanic membrane, whose function resembles that of a drum skin struck by sound. Its learned synonym, "tympanic membrane," derives instead from Greek "tympanon," meaning a small drum.
How eardrum is actually used
"Eardrum" is the everyday term; "tympanic membrane" is its formal medical equivalent, used by clinicians and in anatomical contexts. It appears most often in medical or injury-related contexts such as infections, perforation, or pressure changes.
Easily confused with eardrum
An eardrum is the vibrating membrane inside the ear that detects sound, whereas an eyelid is the fold of skin that covers and protects the eye.