middle ear 
noun
The air-filled central cavity of the ear, behind the eardrum.Lying behind the eardrum is an air-filled cavity known as the middle ear, which is connected to the back of the throat via the eustachian tube....
- In some cases, a doctor may suggest inserting a tube through the eardrum to allow the middle ear to drain.
- The outer ear picks up sounds and passes them to the middle ear through the eardrum.
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