letterbox
let|ter|box /l'etərbɒks/ (letterboxes)
also letter box
1 [N-COUNT]
A letterbox is a rectangular hole in a door or a small box at the entrance to a building into which letters and small parcels are delivered. Compare post box. (mainly BRIT; in AM, usually use mailbox)
2 [ADJ]
If something is displayed on a television or computer screen in letterbox format, it is displayed across the middle of the screen with dark bands at the top and bottom of the screen.
also letter box
1 [N-COUNT]
A letterbox is a rectangular hole in a door or a small box at the entrance to a building into which letters and small parcels are delivered. Compare post box. (mainly BRIT; in AM, usually use mailbox)
2 [ADJ]
If something is displayed on a television or computer screen in letterbox format, it is displayed across the middle of the screen with dark bands at the top and bottom of the screen.