terreplein

ter·re·plein  (tr-pln)

n.

A platform or level ground surface on which heavy guns are mounted.

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[French terreplein, from Italian terrapieno, from terrapienare, to fill with earth : terra, earth (from Latin; see ters- in Indo-European roots) + pieno, full (from Latin plnus; see pel-¹ in Indo-European roots).]

Thesaurus

Noun

1.

terreplein - level space where heavy guns can be mounted behind the parapet at the top of a rampart space - an area reserved for some particular purpose; "the laboratory's floor space"