Other forms: shutters
A shutter is the hinged cover that closes over a window from outside. Close the shutters, wooden shutters, shutters open.
They keep out sun, storm and intruders, which is why they are standard in hot and in exposed places and rare in modern British building. Shutters are also the internal folding kind fitted inside a sash window. In photography, the shutter is what opens for a set time to expose the sensor, and shutter speed is one of the three controls that decide the picture. Note shuttered, meaning closed up.
1nounshutterA hinged cover that closes over a window.
“Every evening, my grandmother closed the wooden shutters on the kitchen window.”
2nouncameraThe part of a camera that opens to expose the picture.
“The shutter was open for roughly a four-hundredth of a second.”
shutter is a cover or mechanism.
Also accepted in games: shutters
Shut plus -er. Shuttle is from the same root — a thing that shoots to and fro — which fits the camera shutter better than the window one.
From shut + -er. From shut + -er. Compare shuttle.
Etymology from Wiktionary, CC BY-SA