Eardrum (noun)

1. The thin membrane in the ear that vibrates in response to sound waves, transmitting sound to the inner ear.
2. A thin membrane in the ear that separates the outer ear from the middle ear.

Origin:

Late 19th century: from ear + drum.

Examples:

1. The eardrum was ruptured due to the loud explosion.
2. The doctor examined the eardrum to determine the cause of the patient's hearing loss.
3. The eardrum was surgically repaired to restore the patient's hearing.
4. The eardrum is a delicate structure, and can be easily damaged by loud noises or infections.
5. The eardrum plays a crucial role in the process of hearing, transmitting sound vibrations to the inner ear.