terreplein terreplein /ˈtɛrəˌplɪn/

noun

1. Level space where heavy guns can be mounted behind the parapet at the top of a rampart  ( terreplein )
   level space where heavy guns can be mounted behind the parapet at the top of a rampart
    The fortress had a terreplein at the top, allowing for the mounting of heavy guns.
   The fortress had a terreplein at the top, allowing for the mounting of heavy guns.