Vallum n. : A rampart; a wall, as in a fortification.

Example:
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Taxonomy
vallum, vallus, valli, Greeks, Romans, branches, fortifications, agger, free encyclopedia, circumvallation, walls, wooden palisade, the Roman, Roman camp, turf rampart, trees, defences, besiegers.

Defination from the web:
vallum usually comprised an earthen or turf rampart (agger) with a wooden palisade on top, with a deep ... Abatis · Castle walls · Castra · Circular rampart · Crannóg · Defensive wall · Hill fort · Sudis · Stronghold · Stockade · Palisade · Trou de loup · Vallum · Wagon fort ...