round window

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Related to fenestra rotunda: cochlear window

round window

[′rau̇nd ′win·dō]
(anatomy)
A membrane-covered opening between the middle and inner ears in amphibians and mammals through which energy is dissipated after traveling in the membranous labyrinth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Catherine-wheel window

A round window with radial mullions. A rose window, wheel window.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.