shutter

Short definition from Wiktionary

Noun

1. 1
   One who shuts or closes something.
2. 2
   Protective panels, usually wooden, placed over windows to block out the light.
3. 3
   The part of a camera, normally closed, that opens for a controlled period of time to let light in when taking a picture.
4. 4
   Any other opening and closing device.

Verb

1. 1
   To close shutters covering.
2. 2
   To close up (a building) for a prolonged period of inoccupancy.
3. 3
   To cancel or terminate.
4. 4
   To rain heavily.

Proper noun

1. 1
   A surname.