adj.
Pronunciation: ' le-t ə r- ˌ bäkst
Variant: also let · ter · box \ - ˌ bäks \
Function: adjective
Etymology: perhaps from the resemblance of the picture on the TV screen or the bands above and below the picture to slots in a mailbox
Date: 1989
of a video recording : formatted so as to display the full rectangular frame of a wide-screen motion picture
– let · ter · box · ing \ - ˌ bäk-si ŋ \ noun