ˈ ̷ ̷ ̷ ̷ ˌ ̷ ̷ adjective
also let·ter·box ˈ ̷ ̷ ̷ ̷ ˌ ̷ ̷
Etymology: perhaps from the resemblance of the resulting image on the TV screen or the bands above and below the image to slots in a mailbox
of a video recording : formatted so as to display the full rectangular frame of a wide-screen motion picture — compare pan-and-scan herein