单词	vallum
释义	vallum /ˈvaləm / noun (In ancient Rome) a defensive wall, rampart, or stockade.There was a ditch on the north side, and a military zone on the south defined by an earthwork called the vallum.... The final addition was the ‘vallum’ to the rear of the wall. A vallum some 27 feet wide and nine feet deep was dug as further protection for the wall. Origin Latin, collective from vallus 'stake, palisade'. Rhymes alum, Calum, mallam
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