Definition of set-top in English:

set-top

adjective

  • Designating an object (usually an aerial or signal decoder) which is designed to be positioned on top of a television set. Frequently in "set-top box"noun Broadcasting a box-shaped signal decoder for viewing cable or satellite television or giving television access to the Internet, or one which converts a digital television signal to analogue for viewing on a conventional set.

Origin

1970s; earliest use found in B.S.I. News. From set + top.

Pronunciation

set-top

/ˈsɛt tɒp/