variants
or louvre
1
: a roof lantern or turret often with slatted apertures for escape of smoke or admission of light in a medieval building
2
a
: an opening provided with one or more slanted fixed or movable fins to allow flow of air but to exclude rain or sun or to provide privacy
b
: a finned or vaned device for controlling a flow of air or the radiation of light
c
: a fin or shutter of a louver
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Merriam-Webster unabridged
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