barndoor
barn·door
noun
1.
an opaque adjustable flap on a lamp fixture; used in photography to cut off light from particular areas
Origin
From barn + door.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.