windowrestrictor
nounUK /ˈwɪndəʊ rɪˌstrɪktə/
US /ˈwɪndoʊ rɪˌstrɪktər/
A small piece of metal or plastic that stops a window from opening too wide.
The windowrestrictor keeps the window from opening more than a few inches.
OTHER MEANINGS
2. A device fitted to a door to limit how far it can swing open.
The door windowrestrictor stopped the door from banging into the wall.
3. A safety fitting used on windows in homes with young children to prevent falls.
They installed a windowrestrictor on every upstairs window.
4. A mechanical part that controls the maximum opening angle of a hinged window.
The windowrestrictor was adjusted so the window could open only slightly.