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–noun
a membrane-covered opening in the inner wall of the middle ear that compensates for changes in cochlear pressure.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: round window
Function: noun
: a round opening between the middle ear and the cochlea that is closed over by a membrane called also fenestra cochleae,fenestra rotunda
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

round window n.
An opening on the medial wall of the middle ear that leads into the cochlea and is covered by the secondary tympanic membrane. Also called fenestra of cochlea.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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