round window

(redirected from fenestra rotunda)
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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.

Catherine-wheel window

A round window with radial mullions. A rose window, wheel window.