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round′ win′dow


n.
a membrane-covered opening in the inner wall of the middle ear that compensates for changes in inner ear pressure.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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A membrane-covered opening between the middle ear and inner ear.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.round window - fenestra leading into the cochlea
fenestra - a small opening covered with membrane (especially one in the bone between the middle and inner ear)
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