shutter

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shutter 

A device that provides a means (mechanical or electro-optical) for letting a beam of light pass during a given length of time.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
A Parapan are a contemporary version of what's termed the 'plantation' shutter that you refer to although they are joined and hung in the same way as louvered shutters. New on the market and created by designer Alison White, the clean lines of these Parapan acrylic shutters and 4mm opaque design will enable you not only to maximize the amount of light in your living space but offer added privacy.
Below, Paloma tall vase in turqoise, OKA Slip cover for Ikea Klippan sofa in Flamingo Park Fuchsia fabric from Designers Guild, Bemz Hot pink louvered shutters from The New England Shutter Company.
In one form or the other, louvered shutters can be seen in houses all over the world: from India to Fiji, from England to South Africa.