| fenestration operation | A rarely used surgical procedure producing an opening from the external auditory canal to the membranous labyrinth to improve hearing in hearing impairment of the conduction type. (05 Mar 2000) |
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| fenestration, labyrinth | The surgical creation of a new opening in the labyrinth of the ear for the restoration of hearing in cases of otosclerosis. (12 Dec 1998) |